If this is the electric one, I recently got one and I am happy with it.
The one thing I don't like is that it is unusually LOUD. I have read several other reviews that say the same thing.
Other than the noise, I think it does a decent job of re-sharpening a blade. I don't wait until the blade won't cut anymore. I sharpen it after every big cutting job. It isn't "out of the package" sharp, but it is close.