Thanks for the report, John! My experience is that the M42 gives the sharpest edge, at least on the 800 grit CBN wheel. V10 just doesn't take as fine of an edge. I can usually feel the difference running my finger across it, and I can certainly tell in finish cuts. I'd say it's the difference of a whole grit for finish cuts for me and the softer torn-grain-prone woods I turn. I still keep my V10 tools in the mix, I just don't use them for finish cuts.