How long you been using it, and how is it holding up? I have two mounted to my handlebars and run them at 50%. Why? It's a symmetry thing. Plus, I like that my primary and secondary systems are not independent of each other. I ordered a terralux lightstar 100 from Amazon (two days before Costco got their lights in stock). Have that mounted to my helmet. Use it on strobe during the day because it's nice to be able to shoot it right at a motorist to get their attention. It's a nice bonus to the handlebar lights though I wouldn't have bought it if I had already had the Costco lights.