from teh reviews I have seen so far the wii fit is a bit disappointing in itself. I know the fitness coach game still sells quite a bit. If you want to try it out I would either rent it from a movie rental place or buy it off half.com or ebay. Its much cheaper than retail
I love it. It is the same as yourself fitness from the PS2. I use my fitness coach 5 days a week for 30 min at a time & have no problem with it. I don't know it would be getting bad reviews, I think is it 100% better than wii fit.