Perfect. Very fun.

Initially skeptical about the correct motion detection, the Kinect finally works perfectly well, once the calibration performed correctly.
The Kinect can land directly in front of the TV (not big).
By cons for proper detection, one must have a free space in front of the TV about 2m50, below is unplayable.

For the fun side: frank parts of fun on such dance games. Ability to play up to 4 (can not be on all the games).
The advantage over the Wii is to not need the joystick in hand.
I have not yet tried to Car games. To see.

And a tip: remove fragile objects nearby, or their life will be short.