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Good points.

I do feel that a microscope in and of itself is not the best guide. But it does help you find out what is going on at the edge as you perform your "other" tests (TPT, HHT, whatever...

I always use 200x as a "standard" ,as that is what Tim Zowada used on his site.

You certainly don't need that high a magnification. As a matter of fact, after a while you can tell how the edge is...

Tou are welcome to use my progression on aluminum oxide lapping film, if you like.

Not the prettiest pics, as I did them ratehr quickly, but shows an edge progression.