Excellent aesthetics, almost industrial design, and does its job well. Minor problems pale in light of its overall excellence.
Positive Product Points
Gives a very consistent grind at drip settings (4-5 on the dial) or espresso (8, or maximum). Very attractive, futuristic-in-a-50's-retro-SciFi manner. Heavy body, substantial motor and power supply.
Negative Product Points
Catch hopper (the glass thing that catches the grinds) is loosely mounted, and grinds sometimes don't completely fall into it (can be remedied by "jiggling" the glass container after grinding). Also, orphan beans tend to remain on the ledge under the glass top-hopper (just above the throat)--can be remedied with a chopstick.
I realized, after commenting on this machine in one of the forums, that it should be time for my followup review. Then, I realized I never wrote a review. Such is age.
Anyway, this unit, though fairly expensive compared to a Wal-Mart grinder or a hammer, does its job well, with a minimal amount of care and adjustment needed. Out of the box, my unit didn't give the finest grind for espresso that I required for my espresso machine (a ProLine, oddly enough). I followed the instructions in the excellent manual to adjust the grind for finer results, and it has been working quite well.
Which leads to one of the many pros for this machine--the manual. The instructions, hints, and care directions are excellent. I urge you to visit the KitchenAid site (or elsewhere on this site) to read the manual before you buy it. KA did a wonderful job of both supporting the device AND telling you why you should use it as instructed.
Many users have complained about the "old" design (and I'm not sure if I have an old design, or if there's even been a redesign), in that (1) beans tend to lodge on the ledge under the upper hopper and the grinder throat, and (2) some grinds tend to not fall into the catch jar after grinding. Apparently, there MAY have been a redesign in the past year to ameliorate these two, but I've found that I can prevent both with minimal effort. First, the orphan beans--I simply push them with the end of a chopstick (which won't work if you keep the upper hopper full during grinding, since you can't see the orphan beans under the stored beans, but in that case, why worry?). Second, the stray grinds: simply jiggle the lower catch jar up and down vigorously (but not enough to break it) after grinding, which causes most all of the grinds to fall into the appropriate location.
I had to adjust the grind setting for espresso after a few experiments (easily done, following the manual, and the simple design of the unit). I've also disassembled and cleaned the unit a couple of times in the past year, which, again, is easily done per the manual.
I bought this at a Williams-Sonoma store in Spanish Fort, Alabama, before said store became a hive of retardation and unhelpful moronic employees. I haven't been back. The W-S store nearest you might not be that bad, and, then again, the Spanish Fort store might not be that bad now.