This is my latest toy. I’m using it as a MIDI controller for AudioMulch (with the help of Ross Bencina’s P5 Glove MIDI software and Jamie O’Connell’s MIDI Yoke).
The thumb and each finger can send a separate Continuous Controller value (using custom flex sensors) as can each of the X, Y and Z axes in relation to the infrared receptor.
It’s fun but somewhat difficult to control. Partly it’s a matter of learning to use it, like any instrument, but also my hands are a bit bigger than it’s designed for. I’m not sure how practical it’ll be for gigging, but it makes a nice change to be able to do more obviously gestural performance (compared to using a mouse or a fader/knob box).

… and if you put it on your other hand it feels like someone else is playing.
Wow, that could be really awesome in performance once you got used to it. I want one!
how flexible is it? ie could you conceivably play another instrument whilst this was attached? two at once? left or right handed?
sure looks cool
Right hand only, I’m afraid. It’d be cool to have one on each hand. I’m not sure how you’d use it in conjunction with clarinet or sax, but I’m sure you have ideas! I’ll probably be using it with one of my Behringer MIDI controllers, to give me more options, although I think it could be good on its own for Splinter Orchestra performances…