The problem, on most machines with built-in grinders, is retention. Even if you reach in your grubby fingers to scoop out one set of beans from a hopper and pour in the new bag, a bit of beans always stays trapped in the gears. You're stuck dealing with these beans somehow. This means making a weird diluted half-drink, mixing your beans, or blasting out half a portafilter's worth of bean grounds before making a new cup. It's nothing you want to do daily—and it makes it a bit of a process to switch to decaf in the afternoon.
The Rivelia has a nifty little bean swap system that lets you uncork one hopper full of beans and swap in a second, with minimal fuss and no mixing of beans. It works like this: When you turn the bean hopper to the unlock position, the Rivelia's screen will simply ask you what you want to do with the excess beanage, which amounts to around 5 grams, or half a shot.
You can choose to get a mini-drink from the excess, or ask the Rivelia to dispose of your little bean problem, sight unseen and no questions asked. Then, just swap out one color-coded bean hopper for the other, and here you are drinking decaf instead of your morning rocket fuel.
The bean swap is a simple and deft solution to an irritating problem that has dogged bean-to-cup machines since their inception. It's also indicative of the thoughtfulness of this device overall.
Easy, Button-Press Customization
Swapping out beans is all well and good, but how's the coffee? The answer isn't straightforward. Bean-to-cup machines like the Rivelia, and other De'Longhi models like the Magnifica Evo ($650) and Dinamica ($1,300), exert just as much pressure as a traditional espresso machine. But they also tend to grind a little less finely than espresso made with a portafilter.
This coarser grind makes the resulting cup a whole lot less finicky, and less likely to be overbitter or deeply acidic, but also less intense. It's a smooth cup, with some of the edges shaved off. It's perfect for those who'd like to just press a button and be ensured a frothy cappuccino without looking at pressure gauges or worrying they'll botch a shot completely.