The only ceramic blade I've owned was an old Boker, which I think was one of the first ceramic folders made (first one I ever saw, at least). I had it maybe 15-18 years ago. It was a really nice knife, and edge retention was THEORETICALLY amazing. However, it really wasn't. Edge retention from abrasive or cutting wear IS amazing. The problem is that they chip and break really easy. If you're cutting through some wood, and accidentally twist the blade a little, it will chip the edge. If you hit something hard and move the edge sideways even a little, it will chip. Basically, after a few weeks, I had an edge that was 85% razor sharp with perfect edge retention and 15% unusable, chipped areas. That made it pretty much unusable. Admittedly, I was like 15 at the time, so I didn't treat it right, but it didn't hold up well. Then I dropped it on a concrete garage floor and it broke in half. I wouldn't buy another.
