I tried it on my asus transformer pad with slashtop. there were some pretty big issues that you have to realize.

1: the bandwidth needed to do it outside a local area network is huge.
2: the wireless xbox controllers they are talking about are probably linked the the main system and not the tablet. when I used my dock keyboard for input on the tablet, I had to press the movement key for each step. so is the xbox controller inputting to the main system or the tablet?