WORKS WELL, BUT PRICEY!
I would have rated this product 3.5 had that been possible.  My main gripes have to do with price.  Gillette made its fortune selling razor blades, and they sold a gazillion blades my selling their razors dirt cheap.  Emjoi have adopted that model, with a twist.  The twist is that they charge a big fat price for their callus remover AND also charge more than enough for their 'blades.'<br /><br />The system is simplicity itself.  A piece of sandpaper, or equivalent, is wrapped around a 2-inch long cylinder made of wood (I think). This is the refill.  When the device is turned on, the sandpaper-covered cylinder spins, and when held against hard skin on the heels, for example, white powder which seconds before had been skin, flies from the foot.<br /><br />I decided that the battery operated model was almost certainly a bad choice because small devices with motors tend to eat batteries, and performance would decline as the batteries declined.  Therefore I bought the AC model which cost just under $50.<br />My first impression was of something that cost a lot less, maybe $25.  It is well designed, very comfortable to hold and to use, and it works well enough with the relatively gentle 'sandpaper' refills that came with it it.  I just ordered coarser refills in the belief that they will work better on my very hard skin.  The refills, which do not last very long, cost about $3 each in packets of 4, and slightly less in packs of 6, 8 and 12.  If you have hard skin on your feet and have had enough of filing it by hand, try this.
Rating: 4 stars