Review (4/5): It'll suffice
I used this for the heels of my feet and wasn't thoroughly impressed. You have to lightly place it on your feet for the roller to go over the area you want. Putting too much pressure will cause it to stop in place. There are three different grinder heads from soft to rough, but I didn't feel as though one was more effective than the other. I do like how easy it was to switch form one grinder head to the other and the concept and idea of the grinder heads. It had to be charged for about an hour when I initially opened the box.