I have owned the Kasumi for several years, still looks great and I have yet to find the need to sharpen the blade. Though I only use it for business conferences and suit carry.
alleycatThe business conferences where the goody box/bag are sealed and everyone juggles keys and random objects around until someone finally pops the question "does anyone sensible carry a knife?" ... and I'm not handing over my nice knives so I give them a Spyderco bug on a keychain.