16' All America, that thing will shoot anything. I have shot real big paints through it with no breaks and small pain with out a lot of role outs.
14' J&J ceramic, this thing is light, cleans itself well, and I use it mainly with diablo and other smaller paints.
And finally, the jewel of my collection, the 12' titanium boomer, combines the super feather light weight of the ceramic, and the ablitly to shoot everything and anything like the all a. I love this thing, and its dye, making it %99 cooler then every other barrel!
I just tried my 12" Smart Parts progressive barrel, and its great... its super quiet... I wasnt sure I shot until I saw the paint flyin' the only noise I heard was the rocking nob coming back... I really recommend getting this barrel...