I have it and I don't really like it. The exercises are good but your movements barely register on the wii. I am busting my butt and she barely moves. I am not imaginging it because my dh watched me do it and my sister had the same problem with hers. I do it for fun after I do the regular wii fit.
I have the same problem.
it's a cool idea, but it doesn't work for me. If I'm running she barely moves. DH is much bigger than I am (300 lbs) and it is more sensitive to him. But, I'm not sure if it's a size thing or if he just is better at video games.