let I first begin by say that I have never buy anything from a infomercial and this be my first . so far I must say , it be be a ok experience . the shake weight work and you definitely feel the burn when you use it . the only downside be the sound it make when use it and with the position use , you sometimes end up twist it the wrong way to a side to side motion instead of a up to down motion . first time I do it my muscle ache and I want to cry on the last rep but it be worth it .