Maybe I'm the lucky one, but I have not had any issues with the LB's. Gotta be frustrating for those that have had trouble. Is it a certain size? I've been shooting 3"- #5's for several years now and not had any issues. I may be the loner on this thread but I would have to say they have been a great shell for me, either sighting in before season, checking new choke tubes, or hunting itself.
I'll jump in so you're not the loner.
I shot Longbeard XRs out of my Super X3 for several years. 3 1/2" shells in 4, 5 and 6. Killed patterning paper AND turkeys with all 3 shot sizes. Never a failure to pop your eyeballs on 30" paper. Never a failure to totally annihilate a turkey.
If I'd ever go back to a modern 12 gauge and lead, it'd be the SX3 and LBXRs. Not even a question.