I have a konosuke SKD tsuchime 210 gyuto and having major edge retention issues. I think it's possible that mine might be defective. So basicaly its sharp for a day at work which isn't by any means to demanding. i use a lot of push and pull cuts and mincing/rocking. I deal with a lot of limes, herbs, cabbages, onions, meats and every so often a lot of lemon grass which i now know to have a cheap knife to deal with. I'm worried that shapening it ever day is going to grind it down to nothing.