Korg PadKontrol; NanoPad; Roland HPD-15 and my main controller keyboard.
(Mostly keyboard and nanopad).
Finger playing seems to lack a real feel to me more and more, and the handsonic requires I run through midi (no USB). The handsonic is cool for what it does, but because all but the five zones are really only finger size, it really has its limits too. I tried out a couple of the other Roland sampling and octapads and finding I want slightly larger pads than they offer for sticking. Room size prevents me from going into their kits though and considering I have my favorite drums ITB, it seems like the optimum would be more a of a hexapad (in the same size as the octapad with the same input triggers) and a simple usb out with no sounds/sequencer in it.
(I'm also hoping they finally get around to adding a USB out on their PK series foot pedal controllers)
At this point, I would suggest only the NanoPad because it's the cheapest, feels and works good.
(I'm probably going to sell my HPD15 & RMP soon)