@ZipLine-- I've owned several nutmeg mills because I love nutmeg and use it often. The first one I had was not very good. It would not grind the nutmegs all the way and a lot of it was wasted. The one I have now however works quite well. It grinds the nuts almost entirely, so there is no waste. It doesn't take too much effort either. So when I'm baking and need nutmeg, I can grind some very quickly this way.
I highly recommend customer reviews before purchasing this type of nutmeg grinder. Read reviews and check for information about the sharpness of the blades, whether the nuts get grated all the way and whether it's easy or difficult to clean the grinder.