I have be use it for a little while now . it definitely give a good muscle workout and its actually a lot harder to use than I think - which I think be a plus because I never imagine that a shake weight would be tough to use at all . it be cheap and it do what its suppose to do . the only thing I would say be do not buy it if you think `` well , maybe its not as absurd as it look on the tv '' ... it be . Trust I . the dvd be aweful ; it be 8 minute of a absurdly buff man act like he be get a sweat from a shakeweight -lrb- it go without say that if you can bench 240 , you not go to get much of a workout from a shakeweight -rrb- . when I first use it , I feel really gay . this be not use derogatorily . I literally feel like a hand a man junk in my hand . do not get this if you live with a woman . she will inevitably make fun of you . if you live by yourself and be willing to suck it up for the sake of muscle definition , then this this might just be the product for you .