I have one, and in my view ANYTHING that keeps some idiot from pulling out or turning left in front of me is worth it....I also have the Oshram 04 bulb which is brighter...yes the fail safe circut turns it on if the unit fails, and a sensor (photocell) trips it off at dusk. With the Road Glide, it's only wired to one bulb, so the other runs "normal" all the time.
And loud pipes on the bike. I ride like every car I meet is TRYING to run me down and kill me on delibertly.....riding since 1965 and have yet to have an accident on the street, but laid down plenty of dirt bikes and have the scars to prove it...FYI J&P has them...