I bought the radius edged CBN wheel several years ago, and don't remember using the edges. Derek had trouble with one, and went to square edged wheels. If I had it to do over again, I would have gotten square wheels, even though I have not had any trouble with the one I have for several years. I can't dry grind in the houses I work on, so I'm going back to a wet grinder as soon as I see some first hand reviews on the Tormek diamond wheels. I'll walk outside to use the CBN wheel before I'll go back to friable grinding wheels though.
I don't understand why using the grinder for correcting screwed up edges doesn't put a hollow grind on the edge in the process.