Charles L.
Enlightened
Of the lights commonly discussed on this website, I've only three issues. The switches on two of my L3 Illumination L10C's have come loose, which required me to re-attach them. The third issue is with my most recent light, and hopefully it will be worked out soon.
Otherwise, a list that includes seven Zebralights, five JetBeams (man, those 2010 vintage JetBeams were nice!), four Nitecores, three Olights, three 4Sevens, three (not including the two listed above) L3 Illuminations, two Petzls, two Black Diamonds, one Armytek, one Streamlight and one Peak have worked flawlessly.
Cheap, "no name" type lights -- sure, I've had several fail.
Otherwise, a list that includes seven Zebralights, five JetBeams (man, those 2010 vintage JetBeams were nice!), four Nitecores, three Olights, three 4Sevens, three (not including the two listed above) L3 Illuminations, two Petzls, two Black Diamonds, one Armytek, one Streamlight and one Peak have worked flawlessly.
Cheap, "no name" type lights -- sure, I've had several fail.