Pros: Easy to use. Included cloud service.
When you first plug in the WeMo Maker, it creates its own wifi SSID, that you will need to connect to with your phone or tablet (download the app first). From within this app, you tell the device how to connect to your real wifi SSID. A reboot and I was ready to go. The app told me that I needed a firmware update, so I triggered it and in a few minutes it reported for duty properly upgraded.
The app allows you to configure the Maker - both the relay (momentary or toggle) and the sensor (yes/no), and also allows you to set up some simple rules. The cloud service had some occasional connection issues and delays, but worked otherwise. Time, motion, home/away, sensing power are all ways things can be triggered, depending on which other WeMo devices you might have.

WeMo's measured power consumption was 1 watt at most (inside the limit of my ability to measure) and wasn't warm to the touch after several hours of on-time.

Cons: This device only has one controlled relay and one on/off sensor.

As mentioned, the sensor is only on/off, not analog (or serial/digital), so its use is fairly limited.

I tried the Maker in two modes of operation, one for raising/lowering my garage door, and sensing its state, and the second in pushing the power button of my PC.

Other Thoughts: This is not your starting point for wemo, it is fairly expensive and requires ability with electrics/electronics..
If you are using the wemo system for lights and other appliances, then this may be the swiss army knife you need to add some other capability that cannot be found in the other wemo gadgets.
Note about the sensor: Why you need a pulldown/pullup resistor. Why? Because the sensor input is so sensitive, that even when its not connected to a voltage source, a few stray electrons could keep it reading a voltage, giving you odd, unreliable readings. More technically, the sensor input is connected to the base/gate of a transistor in the WeMo which draws very little current, so the use of a pulldown/pullup resistor ensures the sensor stays at its "resting" voltage when its not being fed a signal, preventing erroneous readings. If you want the sensor to be normally seeing 0 volts, then connect a pulldown between the sensor and ground. When you apply 5 volts to the sensor, just enough current will flow down the resistor allowing the sensor to "come up" to 5 volts, and the sensor will be triggered. Disconnect the 5 volts and the remaining electricity will flow down the resistor, pulling the sensor back down to 0 volts. Its that simple. http://en.wikipedia.org/wiki/Pull-up_resistor

Pros: The WeMo Makers integration with wireless network is incredibly simple to say the least. The app integration is a great touch as well and just like connecting the WeMo Maker to your wireless network, its incredibly simple to setup on your smartphone or tablet.

Amazing support for IFTTT coding that lets you create powerful connections with one simple statement: IF this, then that. Some of the easiest coding in my opinion.

The app is very useful when it comes to commutation with the WeMo Maker, simple clicks of a button to turn it on or off, even creating customized automation rules and schedules to fit your personal preferences is easy for anyone with this app.

Now it is only for low power devices so there are quite a few options to choose from in the low-volatage/amp range.
For example you can, create a trigger to open the pet door for your dog at sunrise or when you log out of your work email for the day and even connect it into a fully automatic 25rd belt fed NERF gun. With WeMo and IFTTT, your imagination is your only limit.

If you a DIY'er and have some background in simple programming and electrical design then this is the device for you.

Cons: Very little to no documentation on using this device and its supported outputs.

Very low voltage/amp devices are supported, it really could use some high capacity output.

Pricy for what you are getting

Another reviewer mentioned this but the app is definitely flaky. It was very easy to setup but after the initial setup and power down, I couldn't get my Nexus 7 (2013) tablet to reconnect back to the device. I had to reboot the WeMo three times for it to connect back to my tablet. Same thing for my phone.

Relay connections 24 V at 1 amp max (Good for one raspberry pi)

Sensor connections 5 DC at 100 mA max

This next part was confusing for me

[Powered by:
WeMo Maker™ PSU: 5 V 100 mA max
The maker receives its power from an outboard 5 V DC @ 2.1 A PSU via a micro USB connection. ]

Though on the USB PSU you get and Maker power input both are labeled with 5V 1AMP so does it only support 5V 100mA max ,5V 1AMP max or 5V 2.1AMP max? 5V 1AMP works great for me.

It can only control one device at a a time. Which when you like to tinker with things this is a bummer. I would like to see the option for more than one device.

Other Thoughts: For tinkers and electrical hobbyist this is a fun little device. Though price tag and flaky app/Maker wireless connection is a really bummer. Price is defiantly a little high considering I can pick up a small wireless arduino uno and case for cheaper than this and it could control multiple devices.

You will need to do some research before you buy one of these, as Volt/AMP support is tiny and the fact that you can control only one device is also a bummer.

Belkin you made a good product but there are definitely some flaws that should be addressed. And your documentation really really really needs to be improved at least give two or three quick tutorials for setting up common questions, such as lights, door locks, temperature sensors...etc. These quick like how-tos would greatly help anyone who is not a tinker and would like to get involved with electronics.

All in all I do really like this WeMo Maker but it does have its flaws and can be quite a bother.

Pros: - Wifi and phone app integration
- Simple

For someone with money to burn this can be an interesting device to get your feet wet with some real-world interfacing and simple "coding" (if you call IFTTT actually writing code). Not much you can get wrong with this thing since it is so darn simple

Cons: It's way too limited for doing anything productive beyond turning lights on/off or opening/closing a garage door, etc. Way too expensive for the ROI, as well. You'd need a small collection of these things to do anything useful.

There is no user's guide and forget finding anything about the internal architecture. The phone software is buggy and the device works sometimes and sometimes it doesn't. I would not trust it with anything more important than turning a light on.

Other Thoughts: It's sad that they could have had a winner her and this thing comes up so lame. For this price, it should have two channels of A/D inputs -- then we could do some interesting things. For example, it would make a neat foundation for environmental monitoring, or even a way to experiment with creating your own remote car starter (you need A/D feedback to test engine RPM or alternator voltage).

Even Belkin's online 'community' discussing this device is lethargic and the best that end users could come up with are things like water level sensing or remote launching a model rocket. Really?

Anyone spending this money would be better suited looking at something else for more bang for their buck. Sorry to sound so harsh but this device is really not worth it.

Pros: Really cool when it works. I was able to turn pretty much anything that could utilize a relay-like connection. Lights, my garage door opener, door sensor, etc... Really cool that you can use IFTTT (If This Than That) coding; this will make it even more fun in the future and being able to do more with it (simple program scripting to allow you to do more with the unit). Nice to have the button right on the front of the unit for testing purposes (to make sure that it will work before you try it with your phone or tablet). I was also able to test it with a touch lamp, and it worked great for that device. Each press of the button on my phone would set the lamp to "LOW-MED-HIGH." Really cool! The actual device seems to be built well and I also like that it has a mounting option. (note, I've had this product for about one month)

Cons: This device really did not offer a friendly first time experience. The instructions are down-right inexistent and the unit would not work properly for me until I performed two hard resets and a firmware upgrade. Make sure you upgrade the firmware straight away! The Phone interface (app) is a little clunky and seemed to work better on my phone than on my tablet. This was on an Android device. Seemed to fare better on my wife’s iPhone 5, but still a clunky experience, sometimes it would work and sometimes it did not. Really bummed that it can only control ONE DEVICE, for the price, it would be nice to see this thing control more than one, maybe 4? That would be nice! The device seems to be pretty sensitive to location; when I had it in my garage, there was some kind of interference, so I had to make sure that it was moved far away from my garage door opener. I then had to make long cable runs to the WeMo to get things going. I also had to extend the power supply, since the brick and cord they give you are on the short side. Testing of the remote access features took time, there was quite a bit of Lag, sometimes only 5 seconds, but other time it could be more than 30 seconds. Maybe it was my cell network or maybe had something to do with the WeMo…? Teething issues with the device?

Other Thoughts: PLEASE, PLEASE, realize that this device is for someone that likes to “tinker” and has a decent understanding of networking and electrical ability. YOU CAN GET HURT with electricity if you do not know what you are doing. Make sure that you have someone around that knows a few things about setting this thing up with AC power that could hurt you. Having said that, REMEMBER that this thing is designed for LOW-VOLTAGE devices… And, low voltage devices CAN interact with high(er) voltage devices, like a garage door opener, so you really need to know how and what you are doing to set this up, I cannot stress this enough. Also keep in mind that the this thing is pretty much a single relay that can handle 1 AMP of current at a maximum of 24 volts (DC). The instructions are pretty bad with this device, but luckily there is a GREAT community of folks on Belkin’s forum. GO THERE FIRST! (Google it) There are some really nice guides and plenty of posts on there that will get you started or answer any lingering questions that you may have. This thing really is a good first start, and I’m sure that they will improve on it. Stuff like this is not going away any time soon, If anything, we’ll see more and more devices that can be controlled over a home network / internet. IF, you have experience and like to work with Raspberry Pi and / or Arduino then I think you will like what the WeMo has to offer. Just take a hard look at the forums and maybe YouTube to get some more ideas. Having said that, if you just want to turn on your lamp so that kitty can find his way to the liter box, just get the Belkin WeMo Switch… So, ultimately, this thing is going to appeal to a limited audience, but the people that understand what they can do with it, will enjoy it. (even with the slight issues) There is still a LOT of room to grow and it will be interesting to see what other connected devices Belkin can think of. I’m going to knock off a few eggs, mainly for the out of the box experience (lack of instruction and firmware issue).

Pros: • Simplistic design and ease of setup with Android app
• Fun project for the DIY person
• Comes from a reputable company with a long history of quality products
• Informative community forum

Cons: • Expensive for what it offers
• Included instructions are worthless
• Needed to do some internet research to really understand how to setup the hardware
• Doesn't come with any screws for a wall mount
• Challenging to make the install look “neat” (thick USB power cable)
• If you are not a DIY person, then I don’t see the value here

My notes will start here:

The Wemo Maker is a tough sell for me. I think you need to really be excited about DIY projects to enjoy the “benefits” that a product/project like this can deliver. From a hardware standpoint, it has a clean design that loses its tidiness once you start installing the thing. This is not something that will look neat on a wall in your house. It’s meant to be hidden, as you’ll have exposed electrical leads, and a thick USB cable to deal with.

I honestly didn't know what to “control” with the device. We already have garage door openers in our cars. We have a nice coffee pot with a timer that we set for each morning to brew. And the Wemo devices that you can buy (lights, crock pots, etc.) are all pretty expensive, and added to the $80 cost of the Maker itself, just doesn't seem sensible from a spending standpoint.

Once I figured out that the install wouldn't be very attractive, I went for the garage door opener option. After taking apart our perfectly working existing controller, I immediately saw what Belkin meant when they said that the installer should have a decent understanding of electrical wiring. I was pretty lost, as I had more wires to work with than ports on the Maker. We have two garage doors (explains the extra wiring) and I wasn't able to figure out how to make both doors work for this. I chose the main door that we park both of our cars in…which left me with a situation that had me using my phone to open one door…and the existing remote for the other…so less than ideal here. I’m guessing that if I had a better understanding of wiring and electrical current amounts, I could have tried to wire both doors in, but I didn't want to fry anything – and I didn't want to spend more money on another unit for the other garage door.

Other Thoughts: Once installed, setup with the phone app was pretty easy. I was having issues finding our home network, but some reading in the Wemo forum pointed at SSIDs with underscores in them sometimes being problematic. I went in and changed our SSID (which had an underscore), rebooted the router – app found our home network just fine. I went ahead and kept this setup for a few days, and outside of a couple of app crashes, everything worked as it should. Garage door opens/closes when you want it to, and while I was semi-interested in an article I read that added a magnetic strip into the equation to send a signal to your phone when you left the door open, it just seemed like more expense and ugly wiring to me.

So you’re probably guessing I wasn't too terribly impressed with the Wemo Maker – and you would be right. For what it does, I think this is an extreme niche product for a pretty specific user, and that user wasn't me. While I was happy enough that I could figure out how to make it all work, I just didn't “get” the excitement out of what it does. Not to be condescending, but “wow, I can open the garage door with my phone”…just doesn't do it for me. And looking at the mess of the install, it would take a lot of creativity and patience to make it all look neat and tidy.

The Wemo Maker is probably great for somebody that grooves on home projects, or likes to do things “their” way (as opposed to the status quo). It just wasn't great for me.