I only have personal experience with one X-Caliber barrel. That's on a .270 WSM, with I believe a 7.5 twist, shooting 165gr Matrix bullets and 170 Berger's. It's my cousin's rifle and I never asked or saw how it cleaned or how it fouled, but I know it shot under 1/2 MOA when I saw him shoot it. Besides that, I don't have anymore experience with them so can't really say if they're great or not.
What I will say though, I would be furious with your gunsmith. That Lilja barrel wasn't free and neither was the work he did. For him to throw away a top tier barrel because of his own mess up is honestly terrible business behavior. Furthermore, for him to replace the barrel without your knowledge or permission is complete crap. I understand this is still a fresh wound, I'm not judging you or knocking you in anyway. This type of stuff really irritates me in any business, whether it's gunsmithing or any type of professional service. It's not like the barrel you had was defective from the get go, it was messed up by him. He should have bought you another Lilja, or something of equal quality and reputation like a Bartlein, Krieger, Hart, Brux, etc. I wouldn't trust that guy if he can't chamber a barrel properly. I would be questioning his setup, how he indicates the barrels in, how he runs the reamer, and every other step, and how much care he takes.
I also don't like how rough the finish is on the X-Caliber he put on your rifle. He literally could have take like 10-15 minutes to clean it up with a scotch bright pad or something that would look at least better than that. Also the fact it was supposed to be a 5R, not a 6 groove, further cements this guys attitude and care for what he's doing. Not that a 6 groove can't shoot or is anymore better or worse than a 5R, but if that's what you wanted, then that's what you should have got. He could have at least asked if you'd be okay with a 6 groove if he couldn't get a 5R right away or whatever. I'm sorry this crap happened to you man. I really hope the X-Caliber turns out to be a tack driver and a great barrel, because after all of this mess, that's the least you deserve.