I have to be honest I have the Norton 4/8 and I use that to refresh my razors. I'm not thrilled with the edge I get off the coti that came with the kit. I've tried with/without slurry, Smith's honing oil, etc, etc. I'm blaming my inexperience with honing in general, but I get a really nice shavable edge off the 8K side of my Norton. Everything I have read (and starting to experience) is that natural stones like Coti's vary and some may not live up to the "finisher" level. Oh well I'll keep trying and hopefully it's just me and not the little Coti that came with the kit.