I tried a few last night at GC, i hated all of them, unfortunately. the worst was the vdrums lite, looked the best, but the pads were all very close together and not adjustable enough. and very very limited sounds, i don't want that much reverb on my drums ever, even if this was the middle of the 1980's, i wouldn't want that much reverb.
the motion was too restricted, i didn't feel like i was playing drums, felt the same as those little electronic pads all in one box i saw hanging around for $200. yuck....
and it would be a lot of work to use my roland sampler, sample my real drums, assign to midi notes, etc., to get different sounds, so it's no go for now for me for vdrums.