Why it's great: A true espresso drinker knows that when it comes to espresso, there are a few things that can't be overlooked when it comes to a quality cup: freshness and a good grinding method. The burr grinder is a known Barista-favorite, as it maximizes the surface area of the grinds resulting in optimal flavor. The BES870 even allows you to adjust the grind and portion size, so you can go from fine to course depending on your desired flavor. 
Instead, our main concern was how well the wand incorporated air and steam into the mix for velvety, frothy texture. In our testing with our coffee expert, he pointed out that inferior steamer wands made giant air bubbles that quickly popped and only pumped air into the milk, without incorporating foam consistently throughout. So, we looked for a steamer wand that made consistent, well-incorporated foam.
It’s not that cone filters won’t make a great cup of coffee — the OXO On 9-Cup still ranked fifth out of 10 in our taste test. But flat bottoms generally allow for the grounds to be more evenly extracted and increase the coffee’s flavor. (It’s no coincidence our other three recommendations have flat-bottom brew baskets). You may have to do a little more tweaking to get this coffee maker’s brew to the best it can be, and that’s the other reason we like the 12-cupper more. This smaller version doesn’t let you tinker with water temperature.
With a Bonavita coffee brewer, you're just one press of a button away from a perfect cup of coffee. We've refined Bonavita Coffee brewers down to the essential elements so it's simple to consistently brew great coffee. The excellence of the Bonavita 8-cup coffee brewer is recognized by the Specialty Coffee Association of America as part of its Certified Home Brewer Program.
“We really love this machine because we love great coffee, but we don’t make frothy milk drinks. This machine produces very, very good coffee from scratch at the push of a button, automatically grinding the beans pumping through hot water, and dumping out the “puck” of coffee grounds into the internal bin. It’s a nice compact size, and fits easily on a counter under the cabinets.”
The term dual boiler is used narrowly for machines with two separate boilers, and more broadly for what are more properly called dual heater (DH) machines,[citation needed] featuring a boiler for brewing and a separate thermoblock (TB) for heating brew water to steaming temperature – opposite to HX machines, where the boiler is at steaming temperature and is cooled to brewing temperature.

For example, if your coffee tastes a bit salty or sour, the grounds are under-extracted, which can be remedied by a finer grind. But what if only some of your grounds are too coarse, and others are too fine – and maybe some are just right? Having uniform grind size throughout your brew basket makes it easier to isolate and adjust this variable in order to get the level of extraction you want. The only way to achieve that is with a burr grinder. Miller — as well as a handful of our other experts — recommends the Barazata Encore Coffee Grinder ($129).
CR’s take: If you’re an aficionado of fresh ground coffee, this Black+Decker is the brewer to buy. As the name suggests, the Mill & Brew goes that extra mile, grinding whole coffee beans just before brewing. As a result, the machine is capable of making a great pot of coffee. Made of plastic with stainless steel accents, this model is easy to use and to clean, earning a Very Good rating in our convenience tests. It allows you to adjust brew strength, and it’s programmable, so you can set it to grind and brew just before you wake up.
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