I've been using one razor and two coticules for several months and I thought I was getting some good edges, so I decided to test them against the Naniwa SS. My Dovo Carre had a Coticule edge on it (by someone else ) so I thought I would use that one. I used 1, 3, 5, 8, 10, & 12k and some Chromium Oxide. I just finished shaving with it...Naniwa wins all categories