Great Idea of the interchangeable heads.
This is fine for my heels, but really didn't do too great on my front callouses.  I have bunions, so I get thick callouses easily around my toes.  I definitely like the rechargeable over the alkaline batteries.  I've had grinders with different wheels before and there was more of a difference between the course and fine wheels.<br />I do like that the heads switch out mechanism is easy to use.  I have about half a charge when I got it and it did charge to full less than an hour.<br />Again, my problem is more medical than aesthetic so I'm always looking for a grinder that has a long lifespan.  Because of how the wheel is set up, you only get a use area of 180 degrees.  I like the interchangeable heads on this one.  I have another one with changing heads, but they go on and off.  This is pretty need with them all in one.  I just wish it had a little more power.
Rating: 4 stars