On ceramics - I bought a ceramic paring knife just to see what all the fuss was about, and didn't really get it. Sure, it's sharp, but it's not "metal" sharp. It's not razor sharp. On a really sharp metal blade you know you can cut yourself (if you were so inclined, I guess) just my pushing your finger into the blade. On the ceramic I got the feeling that you would have to move your finger back in forth a little - almost as if its sharpness was due to micro-serrations. That, coupled with the fragility of the things and their limited size, left me nonplussed.