It is not possible to really review if this machine works as of yet. I have only used it twice and the instructions indicate that it will take up to a year for the hair to die completely. BUT I can say this - I can tell it IS working. The flashes of light are extremely bright and leave marks on my legs where the cells are being fried. And the after affects leave my legs warm and red. AND this is the an expected outcome. I am solidly hoping this machine kills my leg hairs. FYI...you get over 20,000 "zaps" of the light which is more than enough I think. We will see in the coming months. Overall, it is worthwhile to give this machine a try. If after correct use my legs no longer look like porcupines - then it was money well spent.