I was hesitant to make this purchase in different critical but in the end everything went well.
Installation is super simple, we set the zoom and move until you hear the "click" and then everything works fine. No need anything calibration, for me the zoom worked directly and carefree.
Where the size of my living room does not allow me to see me around (head or feet cut off depending on the position of Kinect) I finally see myself entirely.
I tested several games (Dance Central 2, Michael Jackson) and I did not have any particular problems of recognition. Two however space saving is not enough to allow me to correctly play two. While in Dance Central 2, it happens to detect 2 people distinctly movements are not necessarily very well received for the 2nd person.
But for solo play or turn the zoom to any problems really brought a plus to my gaming experience because otherwise I would not have been able to fully play dancing games in my living room.
So it's not a purchase to flee because it works even if it does not double the playground.
Thank you.