Simple operation and works very well
I've tried many different devices for removing calluses on my feet, and this is by far the best yet.  The price is reasonable, it is easy to use, doesn't require a lot of space for storage, and replacement abrasive discs are readily available.  You get a supply of discs with this device, and the discs are robust and hold up well.  Removes calluses rapidly, but I have yet to experience any discomfort due to skin abrasion.  It seems to leave living tissue alone and only removes dead tissue.  I'm sure you could overdo it if you purposely tried, but I can't picture someone accidentally doing so.  I've disposed of all other files, stones, or grinders as I see no further need for them.
Rating: 5 stars