I should add, I still hand file too, I actually like to hand file...I have a full time job, woman, 18-month old girl, cut wood on the side, rebuild saws obsessively, etc....as you can see getting spare time was a problem for me.....I decided to try the grinder...now I can add that I sharpen chains on the side and have paid for 1 of my 2-CBN wheels with sharpening profits already....
I was the guy that said "grinders can't possibly do what files can"....well guys quite frankly I was wrong, if you have some motor skills, are not a ham fisted Neanderthal, and practice on the grinder, you can turn out great chains....