I read somewhere, (forgive me for not being able to recall the specifics), that the functionality of this was a bit dicey.
Specifically, there were issues with recognition of keystrokes, not being terribly tolerant of variations in the surfaces it could be used on and so forth.
Since I'm not a 'hunt and peck' type of typist, (which is apparently how it works best), I don't know how functional it would be for me.
On a MAME setup, I imagine it would probably be a fantastic solution.

A quick google search, ("laser keyboard review"), turns up a wide group of varying reviews...some good, some bad. I don't know if I'd pull the trigger on this thing at that cost...

Just some random rambling, but somewhat related to the topic...
