I have carried a Surefire 6P for over 20 years and replace the batteries about every 4 months. I also purchase my batteries from Surefire to save money. Thus said, I also have E2 Executive and Z2. Since I'm in civis now days, I carry the E2 either cliped to the front of my pants in the belt line or in my t-shirt holster. The Z2 sits by my gun safe. As far as how to deploy them, I train with both the Harris and Rogers. With the Z2 I use the Rogers style of grip and with the 6P and E2 I use the Harris technique. I hope that helps. Oh one final point, I have found that the E2 Executive is my favorite of all hand held lights to date.