i hired one over the weekend, archery, gladiator duel and ping pong were alot of fun with 2 motion controllers, some of the other games were a bit average, it feels more accurate than the wii controllers.
One thing that might be a problem for people is that you need a bit of room to play, usually you have to stand 8ft away, and when playing 2 players we kept hitting each other with the controllers, also the room cant be to bright, otherwise the camera cant see the contollers.
After hiring one out, i'll probably grab one down the track as i think it shows alot of promise.