I saw this stone advertised on The Superior Shave web site. I purchased a coticule from them that is nothing short of fantastic. I was looking for a Ark stone for my son-in-law when I came across the Convex stone. I watched the video on You Tube about honing on a convex stone and it peaked my interest. The idea of a stone not perfectly flat was against everything I have read and seen about honing. I should have the stone tomorrow and will take it out for a test hone. Anyone used a convex honing stone? I know the purist's will be screaming about the idea of using anything that isn't perfectly flat, but remember, everyone thought the world was flat until Columbus set sail.