Buy this! If you are interested in balance and tone, buy this core strengthening beast. The easiest way to supplement your Pilates or yoga. I was shocked when I woke up the next day and I was mildly sore (in a good way) from my 20 minutes at level 2. You have to try it!
I've tried this only a few times. Sadly, it makes a rattling sound when it vibrates. For the cost ...not ok. I haven't had consistent workouts yet to say how I feel about it. I do feel like it has helped my recovery from tough workouts.