But it doesn't look like it's going to be very comfortable to use :-s
My feelings exactly. Also, notice that there already exist some devices just like this one (although i'm not sure if they have the "force feedback" feature).
I don't think it could be used for gaming and work, but sure does look like useful for making sculptures or 3d models.
Still, keeping your arm in that position for few hours would surelly generate some pain.