Haven't played with a Rocky myself so can't really say... but I will throw in my observation about grinders. The grinding beans part of their job is the least challenging part of what they do. Getting precision grind is easy. Doing it without huge noise or mess and without the possibility of locking up and jamming and burning out the motor is where the engineering efforts are going.
Back in the day 15 years ago I went from using a little Salton burr grinder with lots of plastic components to a Saeco grinder. The Saeco's burrs were mounted in a giant solid brass screw mechanism for adjusting... once you dialed in a grind, it wasn't going to change... and you could grind as fine as needed and moreso... but the thing spun so fast that it threw grinds all over the place and was a total mess... and noisy. So I retired that and got a Baratza Preciso. Fantastic when it was working, but lots of plastic bits in it kept breaking when I tried to throw lightly roasted beans at it. It spun much slower, made less mess, was quieter. But fragile. So I'm now using an Ascaso, which is pretty good. A little noisy, chokes on a bean every so often and needs to be cleaned out, but great adjustment mechanism, and minimal mess compared to the Saeco.
Moral to the story is that just about any burr grinder can grind your coffee to the texture you need it ground to... even the hand operated ceramic grinders do that... it is the externalities and how the engineering deals with them that is where the pricey grinders earn their value.
