I have to put my 2 pennies in....
I owned the Rocky and I own the Cunil... OWNED the Rocky. I hated that thing in so many ways: no matter what I did to adjust the grind, I could never get it dialed in. Plus it was noisy, plus my first one died within 6 months, plus, plus, plus. I had spent probably a year reading reviews on the Silvia and Rocky before I purchased them so when all the problems occurred, well it was like finding out Santa wasn't real when I was 6. The Rocky was not what it appeared (to me).
With the Cunil, I still own it and love it (I scored a Mazzer that I'm using that right now so I have a reference point). It's easy to dial in the espresso grind even with a smaller bean. I've never had a problem with it. It's a great workhorse.
Hope that helps.