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Pros: They're cheap. Prolific drivers work perfectly on OSX. (use device /dev/cu.usbserial) It was a little trickier to get it working on Debian Linux, but managed to get that working also. I have used these up to a baud rate of 921600 and had no problems. As for the voltage line on the device, I'm assuming it's a straight connection to the 5V power from the USB port. I haven't powered anything more than 50-100mA, so I can't really speak to what it can power. If you open up the plastic case, there is a pad for 3.3V. (I measured it to be more like 3.5V) Looking at the datasheet for the PL2303, it has an internal 3.3V regulator and it provides this voltage on one of it's pins. I moved the red power line to this 3.3V pad for use with a 3.3V device. Works great so far, but I need to double check the maximum current rating of the onboard regulator.
Cons: I would prefer male pins on the serial end, but that's just a preference. No real "cons".
Other Thoughts: Some of the description details aren't accurate. There are only 4 pins (5V, Tx, Rx, Gnd), and there are no status LEDs.READ FULL REVIEW
This review is from: Bright Green Laser Light Beam Pointer Pen 5mw Powerful Portable Mini Keychain
Pros: Very bright. Runs on a single AAA battery so you don't have to keep buying coin-cell batteries. Shorter in length than a standard laser pointer.
Cons: I have read that there are a lot of generic laser pointers that claim to be 5mW, but actually put out higher power, along with leaking out UV light. If this was made by one of the reputable "name brand" manufacturers, I'd have more confidence that this one doesn't have the same problem.READ FULL REVIEW
Pros: Works at 115200 baud to connect my Mac with a microcontroller. Running C code from the command line. Worked "out of the box" without having to install any drivers.
Cons: Cable could be a little longer for my needs.
Other Thoughts: Haven't tested it up to the maximum baud rate yet.READ FULL REVIEW