It's a nice barrel, looks pretty good, and is very accurate and resonably quiet. It seems to handle a pretty wide range of balls pretty well, and is rather consistent and rarely breaks properly sized, decent quality balls. I've had great luck with mine, and two others I've used on other guns also. Very accurate and rather quiet (although some guns are just loud to begin with, so this won't quiet those guns all that much), and rather forgiving on paint (the three I've used have all been the medium bore versions). Also can be bought in a variety of lengths (some barrels like the bigshots can't)
The biggest drawback to this barrel is the price, which is usually around $120. I personally don't think it's absolutely worth $120, as there are barrels just as good for less money (like the bigshot or J&J). Also, the teardrop porting can sometimes be a pain to clean paint out of if you get hit in the barrel or break a ball in the barrel.
All in all, I'm happy with this barrel, but I probably wouldn't buy it again given the chance, unless it was a lot cheaper. The accuracy is great with it, but in my opinion the bigshot or J&J perform just as well for a lot less money. It is a quiet barrel, but I find the J&J's to be quieter, and the bigshot is a bit louder (but noise with pball guns doesn't bother me really). It's a great barrel if you like the looks of it and want a good performing barrel and have the money to spend and want a certain length, otherwise you might want to look at a bigshot or J&J.