If you do "old work" you might find the Dremel handy for cutting out old boxes and rusted up hardware. It will grind nails or screws off and make short work out of surgically removing a plastic box (taking it out in pieces). If you have patience you can even do a metal box. I saw a guy cut off a muffler with Dremel once. It took 20 minutes and several wheels but the result was pretty.
If you are trying to save the finish it is a lifesaver to have a precision cutting tool.
