This all-metal workhorse grinds espresso beautifully and runs quieter than most competitors, but the stock adjustment dial is the size of a shirt button and makes fine-tuning feel like defusing a bomb in the dark. The 55mm burrs are excellent, the build is tank-like, and the compact footprint fits under cabinets, but displays fail after six months for enough users to matter, and true single-dosing requires an aftermarket hopper and bellows the factory should have included. Buy it if you enjoy tinkering with a strong modding community behind you, or if you'll use the hopper as designed and can live with 2g retention. Skip it if you want plug-and-play reliability or resent paying $400 for a grinder that needs fixes out of the box.
A mechanical tank with commercial-grade 50mm flat burrs and a track record of owners grinding daily for 15, 20, even 28 years without a hiccup. The stepped adjustment makes dialing in a slow, fussy process, it clumps enough to need a WDT tool, and switching beans or brew methods turns into a cleanup project. If you want one grinder for one setup and prize longevity over convenience, the Rocky earns its reputation. If you rotate beans, chase workflow speed, or need stepless precision, you'll outgrow it fast.