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I just watched the E3 tech demo, and it has one major problem. lag.

So for the party games like what the Wii does, it should be awesome, but for more hardcore games like FPS, and fighting games with tight timing, it's a poor control system.

Still a cool thing, just not the tech for tight timing stuff. The PS3 thing looked insane for timing gesture stuff though. Not full body, so not the same thing, but great for FPS's and fighting games.