The grinder uses 65mm special steel alloy flat grinding burrs powered by over 500 watts of power. The end result is raw speed. It will turn 14 - 15 grams of light roast hard bean Ethiopian Gedeo Worka beans into powder in 4 seconds. That is fast. The grinder motor is nestled in a thick shell along with rubber bushings to dampen vibration and reduce noise. The grinder is quieter than anything with a motor I have heard so far either on YouTube or in person. This noise issue was the main reason I went looking for an upgrade in the first place. My old grinder is more than capable but is very noisy and slow by comparison.
The Mahlkönig K30 ES grinder features two programmable shot timers - one for a single shot and one for a double shot. I have the double shot button programmed for 4 seconds so when I press my portafilter into the button under the built in half funnel the grinder will run for 4 seconds and then stop. The portafilter basket will be full if you set it up right and this timed measure will be repeated over and over till the grinder is reprogrammed.
One nit pick
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for the K30 ES model I hear is that it is stepped so it isn't as good for espresso as a stepless grinder. With burrs this large the space between steps is very small. I have yet to hit a spot where I need something different than what is provided. Even with marked steps this grinder is essentially stepless if necessary. If you can work an Allen wrench to loosen two bolts the grinder becomes stepless and a fine tuning can be made without opening the machine up should a different setting be needed. Another ding that comes up is clumping. I modded (taped open inside the machine) the chute so this is a non-issue. Humidity and bean choice play a role in clumping too. Not a complaint but for home use finding a smaller hopper might be something to consider since the standard hopper holds three and a third pounds of coffee beans.
The best feature is the grind quality - it is outstanding. The powder packs and shots pull without channeling giving up flavors not found in other grinders I have tried or own. The deep chocolate and nut middle and finish is emphasized with this burr set but if the espresso is bright that will come out as well. The shot will be balanced as well as multidimensional. For my tastes I think this is close to a perfect grinder. For home use it could literally last a lifetime too.