Mine came apart once during dough-in, and I worried about it enough thereafter to switch to a braid after a few more batches. I had put about 20 batches on it, and I guess heating/cooling cycles together with assembly/disassembly had worn out the fittings enough that they were loose. It came apart between the tee fitting and the bulkhead.
It will ruin you brew day to have to reassemble your manifold at the bottom of 150+ degree mash.
That said, it worked fine for well over a year.
"I'm Dr. Henry Killinger, and this is my magic murder bag."