I've got Surefire and Streamlight. I've seen both break. The Surefire lights are infinitely more difficult to get them to fix when they break.
I don't know about the strobe functions because they're a terrible idea that I refuse to have on a weapon mounted light. (The only potential use for them is when directing traffic in the dark, and the usefulness they add then is completely negated by the terribleness they add any other time.)
