Pros: -Fast
-Fun
-Massive amount of possibilities
-Great Software
-Many Paid and Free applications

Cons: -ok, but slightly small Operating Field.
-Hard to get used to
-sensitive

Other Thoughts: If it was easier to use then this product would become huge.

Pros: really fun
beautiful, probably cheapest way to add "touchless" touch navigation to your desktop
hardware is accurate as described

Cons: software written for it is typically less accurate
range of motion limited: switching between standing and sitting can make continuing to use the input difficult
there should be a free gesture mapping tool that works with a number of gestures, preferably even learns to recognize custom gestures
intel perceptual computation will soon be the norm, and will be likely be a more robust, more distance-enabled version of this (if costing 2-3x as much)

Other Thoughts: the thing about "gorilla arm" is kinda true with a standing screen, but that isnt necessarily a bad thing. after a little while you get used to it. you will likely fall back on the mouse for precision, but use the gesture control for scrolling, some app switching, media controls, etc