Wish I had this sooner!
I had high hopes for this after reading the reviews, and to my surprise it totally lived up to the hype. It did take a really long time this first time (about an hour), because there was so much to file down. My feet look like they used to years ago. Despite getting regular pedicures my heels and big toe calluses were out of control and had what seemed to be permanent lines that I feared would just get deeper and worse until I turned into my mom. I had tried various tools over the years and some just seemed to make the lines more pronounced or just failed to make any meaningful difference. Now I want to get one for my mom!  So easy to use that I was able to do this while 9 months pregnant.
Rating: 5 stars