Well, I have never used a Streamlight, except for one of thier pen lights, and have been a Sure Fire user for many, many, many years. (If it ain't broke, why fix it.) I keep a 6P in the center comsole of my truck. (Behind the backk seats I have a plug in spot light {from my night security officer days}, and a green 2 D Maglight that I have had forever, and it justs get transferred to each vehicle I buy.) I have an E2e that I keep in a jacket that I wear daily, when I wear a jacket, serveral SF's in the drawer next to the bed. I gave the spousal unit 2 yellow G2's for Chistmas last year; one for the vehicle, and the other for the work backpack. They make a nice non-lethal weapon!! When I was a security officer, and if I ever go back into that, or get into LE, I will always use a SF!! I carried a 6p for a long time on duty, but found that they G2 works better when working around the water or in a humid environment. such as where I live. I have given my youngest sister a SF to keep in her car or on her person, whichever she chooses. I TRUST SF's!! I trusted Maglites, until I discovered SF's, and haven't bought a Maglite since. (not that they are a bad light by any means!!!) I have said enough!!