Review (5/5): Very effective, but a small quirk
This machine makes removes callous material very quickly, especially with the extra grind wheels supplied. One quirk I found: when the machine meets resistance it will stop. To get it started again, one must hold the power button down until the machine comes back on. I thought mine was defective until I found the way to restart it. It holds a charge for quite a long time, so recharging can be infrequent.