I have a Kyocera 5inch utility kitchen blade which I bought last year. They stay sharp for a very long time. I recieved mine out of the box sharp, but not scary sharp like i like my knives. Problem is that you have to send them away for sharpening.
They are also very brittle, my tip has already chiped from falling on the floor.
I like mine. Itz kool, almost like a toy because of the plastic like look and almost no weight. It cuts good because the blade is so thin, but i think i would prefer a steel knife which i can sharpen to a razor edge every time to be my main knife.
TornAdo