I have be use this product twice a day for 2 week and I have to say , it seem to be work well for I so far . yes it do make a noise but personally , do not bother I at all . if you be look to create definition in you arm , I do not this this be the product for you . if you just want to slim you arm down , this should work well . it be difficult to use at first but once you get the hang of it , you will start to feel it work right away . I have already notice a difference in my arm and so have my husband . I be give it 4 star because of the difficulty of first figure out how to work it correctly . other then that I be love it . it be like any work out equipment . the result reflect the effort you put in .