Thanks for posting the links, Indy._______________________________________
Here are two pictures of the device in action.
<- You can't see the sensor in this picture, but I think it gives a good idea of some of device's precision with respect to a still-object (the hands).
<- The device is pretty small. You can see it just above the keyboard. It connects to the computer via USB.
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Just ordered (pre-ordered) two.
I've pre-ordered one myself

.