I haven't had as much experience as some of the members here, but I've toyed with a handful of different brands and my Surefires are the ones that keep working consistently, regardless of the use they see. I have no experience with HDS, which seems to be another top contender here. I can say you should stay away from Fenix for a light that you might need to bet your life on. I've owned 5, and 3 had problems. I now only own one, the P1D. I own several Surefires and continue to enjoy their reliability and usefulness.