If you are talking about the Tru Cut sharpener, here is a video that explains what it does and what it sharpens. 45 and 60 mm only.
http://www.youtube.com/watch?v=75VDKOu-kqE
I've heard lots of different reviews on other sharpeners. I don't think I would buy one.
I recently sent a bunch of blades off to Just Wright Sharpening to recycle them. You send your dull blades in, pay $2.00 a blade and get replacements.