Impressions - favourable. Sensitivity in some menus/demos seems much better than others.
Played on a demo of dance central. Seemed pretty good. A few doubts about the longevity of the game and at £30-40 it's a bit of a toughie.
Played on Kinect Adventures -
20,000 leaks, not my favourite, very similar to Wii stuff.
River rush, a good laugh, pretty good fun. Think this one has a fair bit of longevity.
Rally ball, pretty good also. Might get bored of it a bit quicker.
Reflex ridge, pretty good fun.
Space pop, a bit more passive, kids may like it more than I did. The advantage this has over the Wii is achievements, may add variety and people persist to get the achievements.
Flaws with kinect - many rooms will not to be large enough/have enough space to have two players simultaneously. They should be all right for 1 player.
You need more space than you do for a Wii, you need more width.
Would I buy one? No.
Do I think it a total waste of money? No.
Concerns, mostly with the game content.