Looks fun, but seems a bit gimmicky to me. Why would you use something that is extra physical effort to use and makes you worse at gaming? I presume people will only really play games against other people using these, which means that the community will be very small. On the other hand, I could imagine these or something like these making the gym more fun as a fitness thing rather than a gaming thing.
Fun.
Did you miss the Dance Dance Revolution mats, the Guitar Hero guitars, the light gun games, DK Bongos, etc etc?