Does a great job!
I bought this on my doctor's recommendation, and he was absolutely right:  It's easy to use;  it does a great job of smoothing out the dead skin and calluses on my bony feet;  and it holds a charge well (I hate rechargeable appliances that run down if you don't use them for a week).  It comes with three interchangeable roller heads in various degrees of coarseness, but so far all I've used is the finest one -- it's probably a good idea to start with that one and move up to the coarser ones if necessary.  (The only drawback is that this file is SO easy to use that you could take off more dry skin than you intend!)
Rating: 5 stars