Just buy it.
First off I don't normally write reviews. It takes something amazing for me to do what I'm doing right now. I have suffered with hard, cracked, pitted, callused feet since my 30s. I'm a guy, I just thought that was life, & I was getting old. I used razor blades, rasps and creams. None of this helped at least without considerable time invested.  I wasn't even looking for anything to take care of my foot problem, & then I stumbled across this. OMG, this thing is off the hook. After about 8 minutes on each foot, the bottom of my feet looked and felt like they did in my 20's. Read the instructions so you don't mess up here device, but other than that this thing is just common sense to use. Now all I use it for is maintenance, & I keep my feet moisturized in between. Oh, I'm still on my first sanding pad, which amazed me since the bottom of my feet were like a concrete driveway.  My advice, just buy it.
Rating: 5 stars