Pros: Ergonomic feel.

Cons: First keyboard came with the trackball DOA. took over two months for an RMA replacement.
Second keyboard (the RMA replacement) lasted about a month before it's trackball quit working.
Third (New) keyboard, the trackball half works, sometimes the optical lift works, sometimes it doesn't. Also the keys have to be pressed several times to register.
Over priced Piece of junk. not even worth using if it's free.

Other Thoughts: Not sure how SIIG is still in business.
I've gave them three tries, never again.

I sent the last keyboard back to SIIG in pieces.

Pros: - compact size
- ergonomic shape fits great when holding it
- great button placement
- built-in mouse functions (in theory)
- wireless

Cons: - poor build quality in both units I bought
- flimsy, loose trackball
- each button must be pushed 3 times to get a response!
- no backlighting

Other Thoughts: I bought 2 of these when they were on sale because the design is similar to another keyboard I had. There used to be an awesome, full-size version of this keyboard made by iMedia, but it's been discontinued. Too bad - I've yet to find the perfect replacement - this isn't it!

Pros: Small footprint, connects easily with good range. Function buttons well placed.

Cons: Terrible, horrible, trackball. Trackball quit working after three days.

Other Thoughts: Another similar keyboard by another Mfg was similar but slightly larger has three keys quit working, so seemes I need two keyboards to do what one should.

Pros: Has the nice placement of right/left keys and left key under trackball.

Cons: Trackball quit working 1 day after the 30 day warranty. Was a very cheap feel to the trackball from the start. I would not have given any eggs but requires at least one egg.

Other Thoughts: I have had other keyboards similar to this by other manufacturers and the only brand that has lasted is no longer made the same configuration.

Pros: ergonomically well designed

Cons: Trackball is just no good. I had one of these keyboards, used it for about a year and it quit. Bought another to replace it and the build quality on the trackball was cheapened. It feels horrible when you try to use it. So, I returned it and got yet another replacement. The trackball worked well for about 1/2 hour and then started to feel very sloppy... so bad than it really can be of any good use. I will not buy this product any more - will switch brands.

Pros: The ergonomic design makes it very comfortable to hold for trackball function.

Cons: The RF range was abnormally poor. Without line of sight there was absolutely no connection and w/LOS the range was about 7-8 feet but was still spotty.
The trackball felt like a toy-aisle dollar-store product. I just felt like I was going to put my thumb through the trackball at any given second. For the price asked, this is a very poor product.

Other Thoughts: I returned this product in favor of another. Anyone considering purchasing this would do well to look somewhere else.

Pros: Pro- It feels perfect for a HTPC and the RF range, while not impressive, is sufficient to keep a comfortable viewing distance from 50+ inch sets.

Cons: Cons- Feels extremely cheap. I've never used a more fragile feeling trackball.
Connection issues if you don't maintain direct line-of-sight are most frustrating even in short range. Very poor RF (in the grand scheme of things). At 2-2.5 foot range without line of sight, the track was sketchy and over 1sec response on keyboard strokes (with brand new panasonic batteries, not the supplied batteries).
This device is far too overpriced for what it is capable of. Only complacency can prevent me from returning it.

Other Thoughts: Other Thoughts- The only reason to select this device is a frugal nature. You, as the consumer, don't feel like springing for a proper bluetooth setup and a higher quality device.
If you're reading this review, find another product. This one is far too expensive for the quality.

Pros: Love the layout of the device, the mouse buttons and scroll wheel are very intuitve. Trackball is great for controlling my HTPC from the couch. Nice full formfactor keyboard makes typing easy.

Decent range for an RF device, replacable batteries.

Cons: This device will break on you after a few months. I've now owned 3 of these and the number keys always die on me followed shortly after with the trackball becoming almost totally unusable.

Like all RF devices you will miss some clicks/key presses from time to time. Definately not meant for a standard desktop/gaming application.

Loses connectivity from time to time forcing you to re-synch it.

I keep coming back because when it works it's great and there doesn't seem to be a better option out there. However, it WILL stop working after a while. I'm 3 for 3 with these things failing on me after a few months.

Other Thoughts: This same keyboard has been sold under about a dozen different brand names, but they're all the same poor quality. I've bought a different brand each time and had the same problems each time.

Pros: - Good working range
- Trackball and buttons are located exactly where your arms expect them to be
- Rare type of product that incorporates trackball, not the tuchpad

Cons: - Manufacturing quality: The trackball was trying to fall off, the keys were hard to puch, the edges are scratchy. Everything looks cheap.
- The keyboard dropped RF module every hour, tech support said "try reconnecting, if it doesn't help, try reconnecting again", sometimes you have to press a key twice to make it work, which makes reliable typing and even point-click surfing very hard.
- If you play games with keyboard you are in trouble. Continious pressing of any key makes keyboard think it is accidential keystroke and the key is "depressed". So for example pressing accelerator button in racing games is problematic.
- The keyboard layout is confusing. No blind typing is possible, the keys are bit smaller than on strandard keyboards and dislocated so you will press wrong buttons.
- Finally the keyboard broke after 2 weeks of usage so the trackball that was not working well before just stopped working at all. Currently I am waiting for refound and searing for better product

Other Thoughts: I've seen exactly the same kayboard on <well-known marketplace, starts with "e" :) > sold under different brand. You can make your own conclusions :)

Pros: - Good working range
- Trackball and buttons are located exactly where your arms expect them to be
- Rare type of product that incorporates trackball, not the tuchpad

Cons: - Manufacturing quality: The trackball was trying to fall off, the keys were hard to puch, the edges are scratchy. Everything looks cheap.
- The keyboard dropped RF module every hour, tech support said "try reconnecting, if it doesn't help, try reconnecting again", sometimes you have to press a key twice to make it work, which makes reliable typing and even point-click surfing very hard.
- If you play games with keyboard you are in trouble. Continious pressing of any key makes keyboard think it is accidential keystroke and the key is "depressed". So for example pressing accelerator button in racing games is problematic.
- The keyboard layout is confusing. No blind typing is possible, the keys are bit smaller than on strandard keyboards and dislocated so you will press wrong buttons.
- Finally the keyboard broke after 2 weeks of usage so the trackball that was not working well before just stopped working at all. Currently I am waiting for refound and searing for better product

Other Thoughts: I've seen exactly the same kayboard on <well-known marketplace, starts with "e" :) > sold under different brand. You can make your own conclusions :)