I have some ceramic knives myself. I have the Kyocera 5.5in chefs knife, 3in paring knife and the 4.5in fruit knife. These are all ones endorsed by chef Ming Tsai and even have his signature on them.
I must say that at first I was totally amazed and impressed with them. They are extremely sharp and I thought to be of the upmost quality. I learned only a few months after having them that I was wrong.
Although they have maintained their sharpness, they have lost their quality. The tip on my chefs knife broke off, and the other 2 smaller knives have serious chips in them.
I was always very careful as to not bang them, scrape with them, use them to pry anything and most certainly, not to cut bones or other equally hard objects.
I tried emailing the company but my email was returned as undeliverable. I have other means of contacting them and letting them know how very disappointed I am with their cutlery.
They have a limited 5 year warranty, where for $5.00 you can send them back and they will fix or replace for free. But I know I have had them for more than 5 years.
So, if I had to rate them on a scale of 1 to 10, 1 being the worst and 10 being the best, I'd give them a 4.
Kyocera knives