I've got tons of lightning cables. (Two by the bedside table (iphone and iPad), one in the kitchen nook, one in my car and one at work. No failures, and I've been using Lightning cables since the 5. The one in my car is pretty beat up (gets stepped on, thrown around, pulled, etc.) but I got it when the 5 came out and it hasn't broken. Still works great, though I'm thinking about replacing it before it potentially does have a problem, but that would be from physical damage...it's in rough shape, with grime and rub marks all over the place, but still no splits or anything to the insulation or head.