Just broke the 9-spd SRAM chain on our DaVinci @800 miles on a climb. Now we're at 340lb. team, but also senior citizens so I'm not sure we're overtaxing the drivetrain. Fortunately, I had a quick link (and some latex gloves) so I was able to get up back on the road. The chain doesn't show excessive wear and I do lube regularly. My LBS said "still looks good", but I'm inclined to replace.

I've searched the archives and find posts that have bad things to say about most brands of chain commonly used; Shimano, SRAM, Wipperman. I'd like to hear from anyone who has either personal experience or tandem-related product knowledge.