I bought this knife as a tester, as after having all my decent knives nicked by a flatmate I was told by a friend to give a ceramic knife a whirl before I splurged on any more steel.
This knife is very light, nicely balanced, and comes with an unbelievably sharp edge (of the cut-through-a-piece-of-paper-held-with-one-hand variety). Chops through delicate vegetables with complete ease, and as you'd expect from a ceramic knife there's absolutely no flex in the blade (as with every other appalling knife in the house!), so perfect for nice straight cuts through meat, fish and... well, almost everything really. We do a lot of soups and stews and cutting through all that raw veg is now effortless. An utter godsend for onions.
Time will tell how long the blade stands up to abuse (although the instructions are very clear on what not to use it on, as well as how you can expect the blade to eventually "dull", via small chips in the edge), but on the face of it this is just as good as a quality steel knife in the same price bracket. The blade feels a lot more substantial than you'd think given its nature, but zirconium dioxide (yup, the same stuff they use for fake diamonds) is *very* tough stuff. These black-bladed knives should be tougher than their white counterparts due to a process called "hot isostatic pressing" which makes the blades stronger.
Downsides? The blade is so perfectly flat that things will adhere to it via suction very easily, unlike a chefs knife with air recesses in the blade; this can be a pain if you're trying to chop something delicate very thinly (e.g. mushrooms); you'll need to slide them off the blade. It'll need a diamond sharpener, but what's galling is that Kyocera only seem to provide a knife sharpening service in the USA (and after seeing the edge this comes with, you too will doubt your sharpening skills). It could also really do with a plastic sheath for the blade - since it's non-magnetic you can't use a knife rack (never liked knife blocks, and keeping it in a drawer with other knives is asking for nicks and chips to the blade).
Highly recommended as long as you're aware of its limitations. Definitely going to buy some more in this range.