The All American two piece barrels are quiet and have good accuracy. They come in three bore sizes and three lengths (I believe). The also have an assortment of splash colors, and basic black. They come in just about every thread pattern know. The interior finish is very smooth.
They are; expensive, accuracy is not as good as most one-piece aftermarket barrels, the porting that makes it quiet also makes it consume gas at a faster rate, and the two-piece design makes it harder to clean and impossible to "shoot through" clean. The only part of the barrel that is guiding the ball is the initial stage, which is no more than 8" at best, the rest of the barrel just makes it quieter by venting the gas.
I had a 16" All American on a Spyder SE, and a 16" All American on my Phantom pump. I found medium bore paint worked well in this (med bore) barrel. I don't believe the barrel is worth what the going price is for it. It compares well with any other overpriced two-piece barrel out there (J&Js, Ironman, OTP, etc, etc.) and is cheaper than some (Titanium Boomstick for instance). I would not reccommend a two-piece barrel of any kind over some of the much less expensive, easier to shoot clean, more accurate one-piece barrels out there, such as the Lapcos, J&J Ceramics, Custom Products Classics, BOAs, or even the higer prices DYEs.