I'm having a few problems with mine.

#1 I can't keep the wingnut on it. After a few minutes I find the wingnut, washer, and rubber washer on the ground. Even tape doesn't stop it from unscrewing.

#2 I put a blade in it and I checked on it after 8 hours (I know this isn't near as long as Glen recommended) and apparently the blade got wedged in there somehow because it looks like the vibrations were trying to make a barbers notch in the end.

I'm going to try it some more, but I think I'll experiment on a throwaway blade for a while.