I am rather thin, flat hair and my big problem is the lack of volume at the roots. I expected this kind of device long time and I must say I am very satisfied with my purchase. We must follow the instructions and departure, we grope a bit but in the end, learning occurs quickly. The result is astonishing and especially the volume lasts long. I do not need to use the device during my shampoo, twice a week. The rest of the time here holds!