I've had 3 BOSU's, 2 home products, 1 commercial. Both of the home units I've thrown out because they would not stay inflated. I'm not sure if it was the plug combined with an overly soft, thin, flexible cover, or what. Bottom line is they simply would not stay inflated. In contrast, the commercial unit, which seems to be made of thicker, more resilient material, stays inflated fine. If you can get a good one that doesn't leak, it really is a wonderful home exercise device. There are many different stepping, lunging, bending kinds of exercises you can do on this getting good flexibility and aerobic exercise at home, in a small space. Also, I wouldn't recommend spending money on the frame, as you can just put the half-ball on the floor and lean against a counter or chest for balance.
Rating: [3 of 5 Stars!]