I have a feeling the wii will become redundant once the proper kinect games start being released. The wii and the kinect seems leagues apart, there is no comparison.

The key to it is space as said, but it doesnt need 'loads' of space really. Most rooms should be fine. You just need to get used to it and stay put in the correct area. I think you can get a pad type thing so you know what area to stay in.