For Coffee? Not a clue, but wouldn't be my choice for that.
If for grain, they are favorably reviewed. I've been between buying
it and the "Country Living Mill" as hand cranked complements to my
Nutrimill. The Diamant appears to be a better mill than the Country
Living, but is twice the price. I have read that the Diamant uses a
sleeve bearing, which isn't as nice as the (roller?) bearings in the
Country Living, but perhaps easier to fabricate a repair for if
you're having survivalist thoughts. If the CL weren't aluminum I
would buy it, if the Diamant weren't so expensive I would buy it. So
I just keep making flour with my Nutrimill and reading the Lehmans
catalog or the Pleasant Hill Grain web site.
Maybe I'll convert my Super Jolly to hand cranked, with a pulley for
use with a tractor PTO so I can grind coffee when the world ends.
Now where can I get a methane fueled espresso machine?