These don't look bad for a few hundred bucks,
http://www.right-tool.com/orchainsawch.html. I doubt they are any less capable,
and at a competition business's price compared to the Stihl.
This is my plan. I'm going to keep buying too many chains all the time until I've got racks full of them. On my off days, I'll put the grinding wheel in motion, and set myself up for a season of dropping dull chains at the job sites without the rest of it. That's a business plan which is better than an excuse to sit around and quack about nonsense at the job sites....err, I mean instead of taking time out to sharpen chains when I should be using them.
Tree Climber 101, you've never had adults for parents or employers before, have you? I'm just saying that's how it seems because you can't even fathom by any means how I,
of all people, could manage to sharpen a chain without resulting in stripping my face off the bone by a popped link.
I don't think the folks you are used to encountering in your woods are.... Anyway, I'm off track now wasting my time on other people's subjective assumptions about other people's subjective assumption, and that is worse than your wick wack alone.