While the Breville Dual Boiler is an excellent value-for-money machine, it lacks integrated feedback systems. Making great espresso is a skill that takes time to learn; on a traditional machine, users often struggle to diagnose why a shot tastes bad. The Decent machine, however, displays real-time charts on its tablet, helping users visualize exactly what happened during the extraction. Furthermore, Decent provides a dedicated user forum where owners can post photos of their shots for expert help, with the company's stated goal being to ensure every customer can eventually brew the "best coffee of their lives."
Coffee pucks are dynamic; as water flows through, the coffee material erodes, losing its ability to resist pressure. A traditional nine-bar machine maintains constant pressure, which causes the water to speed up through the puck as it erodes. This is why shots often transition from dark to light very quickly, leading to uneven extraction. This "flat" pressure profile is widely considered a major drawback in modern espresso theory.
Lever machines allow the user to manually compensate for the erosion of the coffee puck. By pulling the lever, the user can apply high pressure at the start and then "lighten up" the force as the shot progresses, naturally creating a declining pressure profile. This technique results in better-tasting, more flavorful shots with less acidity. Many modern espresso machines, including the Decent, include profiles specifically designed to mimic this declining pressure curve.
Lighter roasts have a lower resistance to water pressure and are highly susceptible to channeling, which often results in unpleasant, acidic, "vegetable-like" flavors when brewed at a flat nine bars. The Decent machine allows users to use specific profiles that treat lighter roasts more gently—often by lowering pressure or increasing flow rates—which brings out fruit and toffee notes instead of harsh, sharp acidity. This flexibility is a key design goal that allows the Decent to pull modern, light-roast coffees that would be difficult to extract well on a fixed nine-bar machine.
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