An excellent grinder if you buy the doserless unit.
Positive Product Points
The rocky does an excellent job at consistent grinding, which is about 95% of what you care about in a grinder. I have a cheap burr grinder that I use for coffee and the Rocky is for espresso, but I recently used the Rocky on some french press coffee and was surprised at how much better it was than the Bodum burr grinder.
Negative Product Points
The doser is a piece of sh*t.
My doser broke a month after I bought the unit. The parts on the doser are very flimsy, and you don't really want a doser for home use anyway since you are not regularly puling shots. So, the Rocky is great at grinding but buy the new version that doesn't have a doser. it didn't exist when I got mine. Maybe they have improved the doser by now as well, mine is a couple years old.
I have also had problems with the unit getting clogged, no beans are dropping down. I used to take it apart and clean it out now and then, but I had to do that too often and now I just hit the top with my fist while it is grinding and that keeps the beans moving through. Wham! ... Wham! .... Wham!