OK, this freaks me out a bit. I'd never even heard of, nor seen, this class of grinder.
I could have used one back in the day, though not for coffee.
How the heck do you USE the thing? I still don't get it.
Are the many variants I see on e-bay pretty much the same, or do some models work best and others suck? What?
And say, that Hario looks pretty good too.