A good quality, reliable grinder that could go on a diet.
Positive Product Points
Great doser Solid build Reasonably fast/uniform grind Stepless on/off switch - I use with outboard timer
Negative Product Points
Huge hopper, large body - home use concerns but they could slim this thing down Adjustment collar held by set-screw (upgraded on newer models, mine is 2011) Parts seem more expensive and less widely available than Mazzer
I purchased this grinder used on Ebay and it arrived in good condition despite a questionable boxing job and styro peanuts being stuck in every possible nook and crevice. It is used side by side with a Mazzer Mini-E utilizing 64mm Super Jolly burrs.
The K6 is connected to a cool vintage Time-O-Lite M-72 timer. First run was pretty unimpressive. Despite it's hulking stature, it ground 18g in about 19 seconds - slow and the same as the Mini-hopper and its 58mm burrs. $40 later and new burrs from a local repair shop, 18g in 9 seconds with decent grind quality that improved noticeably as the burrs seasoned.
Daily use has proven to be uneventful. The K6 is consistent and reliable. I feel grind quality is not quite the equal of my Mini-E based on the appearance of the extraction from a bottomless portafilter but taste in the cup is fine. Adjustments are a bit more straight forward with the Mazzer but not a big deal. As noted above, the doser works well and sweeps cleaner than a Mazzer.
Visually, this thing is imposing, which is fine for a shop but not so much in household kitchen. A smaller hopper can be purchased though at considerable expense. Luckily I ply my wife with frou-frou beverages so she puts up with it.