I have an older Boker ceramic lockback Delta, and I really like it. Granted, you can't use it for heavy cutting, but it slices through rope, packages, and anything else like a wonder. If you ever need to sharpen it, which wouldn't be for a long time, Boker can sharpen it for you, but for a fee I think. What I like best about it is that it is really light, and looks nice also, as a classy knife.
Luckily, I have never broken the blade to my ceramic, which can happen if your not careful, but maybe that's because I baby it sometimes. However, once I did drop it (while open) and a part of the tang broke off, right where the notch is, so the lock didn't work. I sent it to Boker and they replaced the knife for free, even though it was a few years old. I admit, then, that I usually carry a steel knife just in case I have some heavy cutting to do.
Also, mine came razor sharp.
pk