I have one too and don't use it much, only if I have a really rough spot after clipping as it is much faster then using a regular emery board.
have you ever tried it on your own nail though? I did and is not the most comfortable feeling I have ever had. If you leave it for more than a second or 2 my nail started to feel like it was being vibrated right in the root and was almost painful.
Women are angels, and when someone breaks our wings . . .
We simply continue to fly . . .On a broomstick.
We are flexible like that.