The Baratza ESP Pro enters a cutthroat market with a cast zinc build and a digital interface that offers more precision than grinders ten times its price. While the internal plastic remains controversial, the inclusion of an Etzinger M2 burr and a new flow-control disc suggests Baratza isn't ready to cede its throne just yet. Can this $300 powerhouse actually outperform commercial cafe equipment, or is it just a polished version of the past?