I bought the 3 stone set from AJ on eBay. They arrived, though the razor I bought is getting some pitting removed professionally. So, I pulled out my great grandfather's Case, which I'm hesitant to use, and gave it a try. According to free description, the thinnest was the Dragons Tongue and the coarsest. I put a slurry on with her slurry stone and went to work. I didn't feel anything. The feedback was just smooth. After probably a hundred passes, it was no better. I know from some reviews I've read this has happened before. So, I went to the people stone. Built a slurry and did who knows how many passes, noticing I could hear and feel the stone cutting. I pulled it off and could get some arm hair to shave off. So, I figured what the Heck. I pulled the thickest stone out, supposedly the Welsh Thuringian. Man, I could hear and feel it cutting. By a hundred passes, it was cutting hair. So, I went back to the purple one, diluting as I went. It shaved arm hair better. Finally, I did the same thing to the thin one, supposedly the d.t. Pulled it off after several passes, diluting as I went. Holy crap that was sharp! I may have to get either a Zulu Grey, translucent arkie, or surgical black if a strop doesn't temper the edge a bit, once I get a strop. That was a little too sharp for me. I'm impressed by how they worked.