If you can get a good deal on a used one, this unit rocks!
Positive Product Points
Big burly kick ass grinder... if you have the space and can find one for the right price, then go for it!
Negative Product Points
Damn, this thing is huge. If you even contemplate putting it underneath overhead cabinets, I don't think it'll work.
This grinder came to me from a commercial restaurant supply place. The adjusting ring and hopper were busted (probably a common occurrence), so it came cheap ($200 CAD). A quick call to Espresso Parts Northwest got me both of those for about another $100 (though I'm still bitter about the brokerage fee that us Canadians get stuck with).
For about the price of a Rocky, I figure I've got a grinder that will last a lifetime and then some. The massive burrs turn out very evenly ground coffee.
This thing is a monster. It weighs in at about 12 kilos and has a 1/4 horsepower motor. It's huge, and probably wouldn't fit underneath any normal overhead cabinets. (Especially since you need to feed it from the top.)
I was initially concerned about the doser being a pain to deal with, but a sweep with an old toothbrush gets grounds off the walls and out of the entry chute quite nicely. Static has been mentioned elsewhere, but it seems that it's only very badly static-y just after grinding. If you dose a few, then the grounds don't fly around much. One thing my bean vendor mentioned is that the doser is adjustable with the knob in the center of the doser unit, but since I rarely have a ton of coffee sitting in the bottom of the doser, I haven't bothered getting precise with the amount delivered on each pull of the handle.
This unit is noisy, but it doesn't scare my cats as badly as my old blade grinder did.
I'm grinding mostly for espresso, but it also does an amazing job for bodum coffee as well -- no more sludge at the bottom of the mug.
Mark's comments about the 80 notch adjustment ring are well-taken. I have to admit that I was skeptical at first, but I really would like in-between settings on the 40 notch ring I've got.
If you're planning on buying one of these used, take a look at the burrs by unwinding the adjusting ring a great number of turns. (There should be a spring-loaded pin that sticks into the bottom of the adjusting ring that holds it in place. You'll need to depress that to unwind the whole ring.) The burrs should appear to be reasonably sharp. If they aren't, it's possible that they've been accidentally ground together in the past. (New burrs are available, but pricey.) Beyond that, check that the motor runs smoothly and that the doser works. (It would help to bring some beater beans with you to the place to actually test...) These grinders are sometimes badged as Brasilia RR 45s.
It's amazing what restaurant supply places will have lurking in dark corners. If you're going to follow this path, you should be somewhat inclined to tinker.