I've broken with plenty of custom playing cues and I've broken a few break cues. Other than a Predator or OB break cue, I don't know of much production break cues that will last. I haven't used a Mezz or Jacoby yet.
Action Zebrawood J/B - Shaft split in half
Viper Cue from Academy - Tenon broke off and went flying
Elite Lightweight Break Cue - Threads broke off inside the joint, sent it back, then the new one broke in half at the joint, sent it back, got a new one and sold it. Then the guy that bought it was breaking with it and the tenon broke off (Never buy crap from Elite)
Schmelke JB00 - Shaft insert backed out after 40 or so breaks (being repaired)
I've had bad luck with break cues. I don't necessarily abuse them, but I do break with them as they were intended to be used. (I break around 25mph, so it's not like I'm really torturing them).