Kinect is simply amazing! I just recieved it this morning, doesn't take more than 5 mins to set-up. Played Kinect Adventures that comes with it, and I have had so much fun, I didn't realise how unfit I was! lol. I've played the Wii before although it is a good console, I think Kinect is so much better. Have ordered Kinect Sports for this as well, so I'm sure that'll great!
I'm the kind of gamer who likes to get as many achievements out of games as possible, so I will be pushing beyond my limits with this thing, and sure I will get fit even more than I am.