My feelings on this are that this thing is as gimmicky as 3D or the Kinect. It'll get good reviews, sell well, be sort of adopted and then the support for it by devs will be spotty and the games that do support it will be half assed.
I think it's better than the Kinect in the sense that more people would use it and more people want to game that way, but it's far from an optimal way to game.
I am all over this shit. Ever since playing the virtual reality game back in the early 90s where you hunted the other person on the chessboard I have wanted this.