In my classroom there were two choices - the old fashion pencil sharpener that has been bolted the wall for the past fifty years or the electric sharpener that always gets jammed or makes so much noise. I had hear about the pencil sharpener from Classroom Friendly Supplies last year and, though it looked good, wasn't sure if it was really worth it. I finally took the plunge and bought a sharpener. I am so glad that I did because it really is the best sharpener. It's super easy to use, quiet and works great. I recorded a short video so you can see how it works.
I know I mentioned this is the video, but while it comes with a clamp I would suggest that you don't use it. I have used it with and without the clamp and I think it's better without the clamp. It falls off and then the kids think they broke it and it just takes up time. There is a permanent mounting bracket you can get if you want to permanently mount it somewhere.

Classroom Friendly Supplies has provided me with this sharpener for purposes of providing a review. I received it at no charge to me and I am under no obligation to return the product but can keep it for me own personal use. In addition, the above link is a referral link.