Bro, I have the Fast Abs. It was given to me as a gift. Personally i wouldnt spend money for anything like it. The shock is not even close enough to get a descent muscle contraction, even on the highest level. You only see results if you are really lean already. i am at 9%bf riht now and at one point I was using it 3times a day for like 20min at a time. You get a mouch better workout doing leg raise and crunches. Dont waste your time or money.