Nice - but it's been over a year and a half since preorders for the Prusa XL began and it still has not shipped!!! It is clear now that people who preordered the Prusa XL had availability sacrificed for the MK4. It just sucks if you've been waiting more than 18 months for that, only for the MK4 to get day-one availability before your long-awaited preorder.
I'm not super happy about the wait myself, but the XL is a considerably more complex beast, and I'd rather see them getting it right than sacrificing quality to meeting some self imposed deadline.