Very Satisfied!
I had purchased another brand of this type of unit (nearly identical) that runs on batteries.  It was a waste of money.  The reviews on this unit indicated it was much more powerful and did not bog down as you pressed it into a callous.  The reviews were correct!  This unit is very nice and has plenty of power.  Like the othe reviews suggested, I picked up an extra 4-pak of the heaver grit sandpaper rolls and they work just great!
Rating: 5 stars