64mm flat burrs, single-dose, and you can swap the burrs to anything.
The DF64 Gen 2 is the grinder for people who read coffee forums. Its defining feature is the standard 64mm flat burr mount, which means you can swap in aftermarket burrs from SSP, Italmill, or others to completely change the flavour profile. Stock burrs are perfectly good — clean, balanced shots — but the ability to upgrade to SSP Multipurpose or High Uniformity burrs transforms this into a genuinely high-end grinder at a fraction of the price. Single-dose design with bellows, near-zero retention, and a stepless adjustment that's precise enough for espresso.
Profitec Pro 300, Lelit Elizabeth, any serious machine
You want the flexibility to experiment with different burr profiles, or you want 64mm flat burr performance at a price that undercuts the competition. The DF64 Gen 2 is the tinkerer's grinder — buy it stock, then upgrade the burrs when you're ready to go deeper.