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I don't know. I've never used it, and I never felt that I needed to use it to achieve the edges I want. And, to answer your first question, it is certainly smooth enough for me.

I found the Escher to work nicely, but have since graduated to a Gokumyo 20K which seems to work even better for me and is a much larger stone.

I've never used CrOx. Perhaps it is just my...