I've fired thousands, if not tens-of-thousands, of rounds of 9mm through my various pistols...though mostly through my Glock 19. I've not had one problem.
However...a completely different story when speaking about my Glock 23 & G27 with .357 Sig barrels installed. I bought a half case of .357 Sig S&B ammo, and had too many failures-to-fire to even count. I'd estimate approximately 25-35% of the rounds failed to fire the first time...and probably half of that number never did fire, with the remainder finally firing on the 2nd, or occasionally 3rd, attempt. I did get lots of practice with "malfunction clearance drills" though...so I guess that's something!
I love S&B, and will buy it whenever it's available at a good price...but I'll never buy their .357 Sig ammo again!
Tim