I have 3 sets of them, never have had one fail. The oldest set are factory on my 05, I put heated on my Roadking in 08-09, and my 11 CVO came with them. I like the heated grips much better then the heated gloves I have. With that and the added part that they are right there, you dont have to plug and unplug them all the time, they are set to go even if you want heat but dont want to stop to get it.