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Not really, but I have seen quite a few posts rating Eschers, Jnats, and Coticules grit.

The stone was more like 3-4k level and pretty slow. I think it had two characteristics that made it unusable, way too slow and medium grit.

In a bevel setter I would want to have fast stone that...

I have a Jnat that is pretty quick on slurry, not quite like 1k Chosera for example, but pretty fast for a natural.