Watch out
Quite powerful.  I recommend being quite careful, and using with no pressure, as it can run through callouses quickly and abrade the skin below and to the sides.  I thought this would stop the problem I had with other rotary callous removers - namely, smaller callouses that become hard and shiny - but it didn't.  It takes off more callous, but the callouses are still hard and shiny.
Rating: 3 stars