It’s a curse. The moment you say “really responsive” in a demo video, the device you’re describing will do something strange. Go to 1:25 above. See?
Here’s another tablet, like the BlackBerry Playbook, that has no buttons. Swiping down from the top of the device with two fingers is the “home gesture.” Watch at 1:57 to see it not work for him. It’s going to be awkward for everyone all the time, I think.
And if you’re curious, Wikipedia has a lengthy article on this device’s sad tale.