It looks like you have to keep your hand over the designated area, so the virtual space is "limited." Not like the Kinect or whatever where your whole living room can become a playground. That being said, it looks impressive, but it doesn't look like it has much real world application, per se. You won't see me holding a gun like that for 2 hours playing a game, not just because of my arm getting tired, but the aiming looks kinda gimmicky, but who knows down the road, after a couple years of improvement.
You have enemies? Good, that means you stood up for something.
It looks really fucking cool and awesome, but the guy's hate on the Kinect is dumb. First of all because of how long the Kinect has already been out when this hasn't even come out yet, and because they're both good for different things. That being said, this still looks really good.