These balls rock...they even make my sotck barrel shoot relatively straight! I have cut my ball use nearly in half because I consistantly hit where I aim now.
having spent several months cheaping out and buying Brass (crap) eagle balls, I can say that I have gone from worst to (nearly) first. They always break on impact and i have shot 2000+ and not had a barrel break yet. That includes having my gun 12" deep in a creek, pulling it out and shaking the water out, and continuing the game...
Weaknesses:
none to speak of...
Conclusion:
buy these balls if you are on my team...buy those awesome (arrggg) brass crap balls if you are the opposition!!!