Amanda, I use one almost exactly like that on my felted items ... and it works great. This will sound REALLY silly ... but did you take the clear plastic "lid" off the shaver part of it? I thought mine had quit working, changed the batteries ... and FINALLY realized that I didnt take the cover off. I have also used a regular disposable shaver to "clean up" those felted fuzzies!
I am DebbieKnits on Ravelery