I want to add a second to everything this person said, I have both a Mk3s that has some upgrades and an X1C and the difference in speed and quality is astounding. They are not kidding either, the quality out of the box is excellent. I basically only change strength related parameters anymore, the automatic flow calibration is incredible. The recent addition of the ability to skip failed parts mid print from my phone is awesome as well. I have also printed the same part with the same layer height and filament and the X1 is almost 3x as fast in “standard” preset.

Also for what it’s worth, I am probably going to replace my Mk3 with the A1 in the next few months as well.