Anything works good with the brass due to its eliptical honing.
Ability to shoot any paint
If you break, it's not the easiest barrel to clean.
The brass barrel from Palmer is not like any other barrel out there. Brass is the naturally slickest material agianst the shell of a paintball which lets the paint fly through the barrel with absolultly no interference. That's not what makes this barrel so great though.
The brass barrel is eliptically honed meaning that the barrel starts off small and then expands in the center only to shrink back down again. It does this because as paint goes through a barrel, it expands. The elipticalness of the honing allows for this giving the ball an even amount of air the entire way through the shot.
Another thing that's wonderful about the brass is that it can shoot all types of paint. Unless you're using stuff that has been left outside in the rain for a couple of months, the brass will shoot it striaght. You could stick some mid range paint through the brass and it would shoot as striaght as marbs through a barrel kit.
This is great if the fields you are at are field paint only. No need to match paint and even if it's crappy paint (as I've found field paint to be) it'll shoot great.
Also, using a barrel kit, you have keep on changing out inserts as the day goes on as paint size can change from bag to bag, and sometimes, even ball to ball. As the temperature changes, paint size can change as well making paint matching pretty useless.
In conclusion, the brass barrel is in my opinion, the best out there. At a cheap price with the option of no venting, spiral venting, and double spiral venting, as well as different finishes, you're bound to get a barrel to match your tastes. I personally enjoy a loud marker so I went with no venting. Some like a quiet marker, double venting would be for them.
Where the brass shines though is that it's basically a one barrel, barrel-kit.
I give it a 10/10. I was so impressed by the barrel (and Palmer's regulators) that I went out and bought a Blazer.