I've carried a Microstream every day for the past year now. It comes in handy so much, from checking fluid levels to airlines in my semi. I drive a truck for a living and a good flashlight is hard to come by, especially one like this Microstream I've been carrying daily. Two days ago I thought I had lost my Streamlight and I couldn't find it anywhere. This afternoon as I got home from a long day trucking I pulled into where I park my truck when I'm home, got out to do my daily post-trip walk around, and noticed my Microstream laying on the pavement. I couldn't believe it! It was still on after two days straight and I know I at least ran it over twice with my semi and trailer on the pavement! I can't say enough about Streamlight products, if they can sit outside for 2 days in the rain and cold and get run over by a semi and still function just like it was brand new, then there's no better product. Awesome Streamlight! You guys hit it out of the ballpark with this Microstream built to last built tough for the working man!