I have their 20" 1:9 chrome lined,diamond fluted.
Finish is kinda "flatter" almost greyish. Not shiny black. It is even and haven't had any problems with it coming off. No complaints.
Now performance. The sin I am guilty of is, I tend to be more of a tinkerer and builder than a shooter. So I am not a good shot by any means. The rifle is free floated with a VTAC. It wears a YHM Phantom muzzle brake with a .308 Phantom suppressor. Topped with a Leupold Mark AR 4X12. I have gotten 2" groups with 55 grain PMC and 1.75ish" with Privi Partisan 55 grain mil-spec.
Overall I am happy with my $195 purchase. I wish I could remember where I got it. It was very hard to find one in stock. I do believe I bought the last one on the internet at the time.
This was for a DMRish rifle, which the fluted barrel was perfect for. I wouldn't use it for a designated bench gun but its a decent barrel.