Review (5/5): Great product if used regularly!
Not sure why there are so many negative reviews on this product. I've had mine for years and love it. Works better than anything else I've tried. It doesn't work overnight. You have to keep using a few times a week to really get rid of calluses, but using this and slathering a good cream on them will eventually work. I've had no trouble with the motor at all. I did replace the sanding disc last year.
Highly recommend this product.