Background info: I drink 2-4 espressos daily, no milk drinks and its City roast for beans.
HG Prime, as a total package, is my favorite grinder to date. Previously owned Nuova Simonelli grinder, Specialita, Niche, and DF64. Specialita was unimpressive and not super consistent for single dosing. DF64 with SSP MP burrs was fun to play with and produces really tasty brews. However the grinder is not fun to live with; the DF64 is too messy and loud. Niche is a close second because the work flow is beans in and hit a switch. My biggest complaint with the niche was every cup had a lingering astringency I could not get rid of. I experimented with ratios, timings, temps and it was always still there. HG Prime is best of both worlds (DF flavor + Niche workflow). Beans in, crank, and shake is my work flow. Brews are tasty without the lingering astringency. Hand grinding is the trade off for 83mm burrs for under $1K.
Build quality is impressive even more so when considering the grinder is sub $1k USD. The OEM Mazzer burrs are a significant portion of that cost. Fit and finish is top notch. Machining tolerances are tight and the parts fit together nicely. The grinder is assembled with industrial grade fasteners, and The only plastic part is the grounds sweeper. The stepped adjustment spacing is fine enough to dial in accurately. Overall, I am really happy and don’t have any urge to upgrade.