I still just don't know.
I want to see someone who is experienced with it play a full round of Counter-Strike with people online and do well, and then I want to see a bit of Civ V, Starcraft, and Diablo 3 or Torchlight 2 played with it for more than 30 seconds. I mean a good, meaty, fifteen minutes or more of uninterrupted play just to answer the question "can this thing play games with the speed and accuracy that I need it to?"
Outside of that, though, Will and Norm kept mentioning the amount of buttons that Steam wants to fit on this thing but I can't help but question button placement. Reaching those face buttons isn't going to be easy and I'm not sure about buttons under the controller.