I got mine in April of this year and like it a lot. Yes, the barrel gets hot when shooting for a while especially when new. I probably have about 150 rounds fired but when I go to the range I try to space the shots so that I can maintain accuracy. This is true of any rifle.
My XL7 did have a problem with the bolt when I first got it, and I sent it to Marlin before I even fired the first shot. They fixed in no time, and have had no problem since then. I've been testing both the 130 and 150 grains Rem factory loads, and so far it seems to like the 130 gr a tad better than the 150. I zero the scope for the 130 and when shooting the 150, I'm about 2 inches below and 1 inch to the righ.
I'm now reloading, and will now better in a 2-3 weeks when I test with my reloads.