It actually works!
It works.  My feet are super callused; this sucker sandpapered them right down to beautifully smooth. It does run a little hot, but I ignored that and kept right on going.  I began on high.  Now to maintain, I can lower the adjustment.  This callus remover also comes with 60 replaceable sandpaper discs -- which is the equivalent for me of 6 months supply, using it on both feet weekly.  If you are frugal, you can use one disc for both feet!  I was extravagantly wasteful (smile).
Rating: 4 stars