Review (1/5): Cheaply made, weak motor, generally useless
Put any amount of pressure on it and the motor is overpowered. You cannot remove even dead skin without pressure. It would take one hundred hours with this thing to resolve your problem. I found it more effective to take the roller off the device and manually run it up and down my feet. The weak motor renders this thing useless for it's purpose.
Cheaply made to the extreme. The switch on mine never worked. It only works if I keep a finger pushing it towards the on position.
It would have been 100x more effective and 5x cheaper just to buy a manual foot file.
This can't even remove dead skin unless you're willing to spent hours trying. The idea that it can remove a hard callous is laughable.