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Nice breakdown in those links on the shaps. Reinforces my experience with them, ie the Pros keep their shape better & cut fast but the trade off is that they cut deep. Not as harsh as diamonds but...

Depends on how you define grunt work ie how bad the edge is. When I did a lot of restores I used the Shapton Kuromaku 320 grit. By comparison the GS 500 is "gentle" & slow.