Best Burr Coffee Grinder for Home Use- Get Your Grind On ...
These are the same burrs that Rancilio uses for its other commercial grinders. As for sound output, the Rocky is a relatively silent machine. It has 2 models, the doser and doserless version. I'd recommend the doserless though. As this is a list of home-use grinders, you probably won't be making cup after cup of espresso like coffee shops do.