The heads up about the pre-burn-in performance is worth while just so there is no disappointment.
But FWIW - I just played my X-MTMs and enjoyed them from the get-go. My guess is they have gotten better, but, honestly, not sure I would know the difference given how much better they are from I came from and never having had speakers at this level. Maybe, because they get use for TV and generally not played overly loud, there wasn’t much to hear in the way of burn-in difference. They amazed me the day I first plugged them in and, now, a little over a year old they still amaze me.