Review (5/5): Amazingly effective! Just be careful with super strong power.
I finally found it!
This works amazingly. Over many years I tried many products to remove my tough calluses but nothing worked as effective as this product. It removed my serious calluses in about 2 minutes.
Just warning though, as other reviewer wrote, it is seriously powerful unit. I used lowest level with fine sander (products came with two different types) but, it is very strong. I didn't place it on the same spot more than 1 second. I let it touch and lift, touch and lift repeatedly.