I wish I could afford to get wrapped up in these Japanese kitchen knives, but I can't. I did just acquire a Lansky diamond 4 hone set sharpener system. Haven't actually set it up for a test run yet, but I have 3 chefs knives all 9in size. one is a Wustof, one is a Warthers, (made in Ohio) and one is an older Chicago Cutlery blade. I also have 2 carving/butcher knives that are also 9 inch blades, one is from the Chicago set and one is from the Warthers set. Both sets also have several other knives such as boning, paring, serrated. SO, once I try the Lansky system out on an old junker I will have lots of work to do. When I do, I suspect I will be throwing out my Chefs Choice electric sharpener.