This works
I hike a lot and tend to get thick, cracked heels. I have tried all sorts of manual and battery powered files, and none were strong enough.  This unit is plugged in, giving it enough power to get the job done.<br />It comes with 60 adhesive disks with just the right sized grit to work quickly but safely. (Some other reviews suggested coarser disks, but these work perfectly for me.)  They say to change the disk every time, but I have found that one disk will last around a week of hard use, which means that the supplied disks should last me over a year.  Finally - something that works!
Rating: 5 stars