I don't think anyone can honestly give you a failure rate. There's a poll on the site that shows the number of people who have reported problems. I felt that the chance for failure was enough that it was worth installing the relays, but you'll find others who think that a switch failure is unlikely enough not to bother. It's just one of those issues that, if it happens to you, you'll be without headlights, with no easy roadside repair. Greywolf recommends it, and his expertise is sufficient enough to me that I decided to do it.
I did add the quick disconnect to the relay. I removed the gas tank and routed the power supply wires for the headlights inside the frame, and it would be a pain to undo all that if I had to remove the fairing. The disconnect is a nice feature.
"No matter where you go, there you are."
Last edited by RCinNC; 05-11-2014 at 09:48 AM.
Reason: additional information