Eureka Mignon Specialità vs Fellow Opus Conical Burr Grinder
This is a dedicated espresso grinder versus a budget all-rounder. The Eureka Mignon Specialità at $449 has 55mm flat burrs and a professional-grade stepless micrometric adjustment, delivering espresso grind quality and dialing precision in a different league. The Fellow Opus at $195 is less than half the price, does filter well and espresso passably, and adds single-dosing and design. Buy the Eureka if espresso is the priority and you'll dial in obsessively; buy the Opus if you want an affordable, good-looking all-rounder.
Spec face-off
Bars scaled to the higher value. Coloured = wins that spec.
Full specifications
Strengths & weaknesses
Full comparison
The Specialità is purpose-built for espresso. Its 55mm flat steel burrs produce a bimodal distribution tuned for extraction with real crema and body, and its stepless micrometric collar — borrowed from Eureka's commercial line — allows grind changes finer than 1/40th of a revolution, resolution no budget grinder approaches. It's also quiet (68 dB) and uses an ACE exhaust to reduce dose-to-dose retention. The trade-offs are that it's espresso-focused (too many fines for clean French press), the 300g hopper isn't built for single-dosing, and the stepless collar has no numbered reference, so you keep a grind log.
The Opus is the affordable generalist. It single-doses bean-by-bean, runs quiet, looks great, and reaches espresso-fine grinds via a hidden inner ring — but its fine-end consistency trails a flat-burr espresso grinder, and it shows static and clumping at espresso settings. It's a much better filter and casual grinder than it is a precision espresso tool.
The gap in espresso performance is large and so is the price. If you pull shots daily, rotate roasters, and care about dialing precisely, the Specialità's burrs and micrometric adjustment justify the $449. If espresso is occasional and budget matters, the Opus covers filter well and dabbles in espresso for $195.
Buy the Eureka Mignon Specialità ($449) if espresso quality and fine adjustment are the point and you'll invest in dialing. Buy the Fellow Opus ($195) if you want a quiet, attractive single-dose all-rounder at less than half the cost and you treat espresso as a bonus, not the mission.