Bob Long Intimidator
eVLution 3 Egg Hopper
Stiffi Carbon-Fiber .689 barrel
Pure Energy compressed air tank
Recommended Paintballs:
Any, really. It's too damn long for anything to roll out of. I'd avoid Monster Balls by general principle, though.
Strengths:
Looks
Accuracy
Strength
Weaknesses:
Inconveniently long at times
Very noticeable
Sometimes makes shots curve
Review:
I picked up a 21" barrel because I thought it would help my sniper game, but I got a different Tippmann with a flatline on it shortly after that, so I never really found out if it substantially helped it or not. It was a big improvement over the standard 12" Tippmann barrels that come on the 98s, but nothing really noticeable.
The barrel really made the paintballs hurt a lot more, for some reason (some sort of spin, I guess?) even though the FPS didn't go up when I put it on. The balls had a tendency to curve off to the side every now and then, but not often enough for it to be a real problem. They did tend to go farther, though, and the porting on the barrel made it a little quieter than the standard barrel, if not by much.
My favorite thing about this barrel is the fact that it can scare new players, giving you that psychological boost that you need to raise your confidence and moral. "Holy sh*t, how long is that thing?" I heard that a lot when I was rocking the old 98. It's not the best for overall improvement, but it is definitely worth a purchase if you're not too concerned about your gun's barrel.
Conclusion:
Buy it if you can't get anything better (like a Smart Parts or a Stiffi) due to financial constraints, or if you just want your gun to look like a monster.