@fribbledom I built my MK3 from a kit in 2017, and added the "S" upgrades later on, and it's been a pretty solid workhorse. The only thing I need to keep an eye on is Z-height and the first layer adhesion, because that shifts ever so slightly with the change in seasons, and I need to spend 20 minutes or so re-calibrating it two or three times a year.
I'm assuming you're a beta tester on the XL? Please post more about it, if you're able and so inclined.