akallio wrote:People seem to think that K30 would be inferior to large conicals. Why is that?
Because it has the same specs as a super Jolly and every other standard Italian bar grinder -- 64mm flat burrs, 1/3 to 1/2 HP motor, 1700 rpm. Mahlkoenig may know things about burr design the Italian makers don't; for instance, the little Vario does amazingly well for its size. But just looking at a spec sheet, it's hard to see what the fuss is.
The various K grinders have been fixtures at the BGA booths for the last few SCAA conventions. The first year they were used, the baristas pretty much rejected them as useless; but more recently, they've become objects of desire, much more so than any standard Italian bar grinder. So it's fairly clear that they've done some productive fine tuning.
I personally have no experience with them; but so far I've never seen any flat burr that has the sheer bulletproof and idiot proof consistency of the big conicals.