Got a Wii system with Wii fit for Christmas. I have found out some interesting things about the Wii since. - If you do about 30-60 mins a day of the aerobics, you'll lose weight. Started 1/2/10 and have lost over 8 lbs. - I have heard from several nurses in our family that dislocated shoulders from the boxing part are not uncommon. They don't mention that in the instructions. - If I reach the optimal BMI numbers, I'll be a walking skeleton. They don't take into account muscle mass at all. - The cat wants no part of the Wii pet function. Generally considers the whole thing a waste of valuable people time. Should be using that time to pet the cat or other cat need.