Ive said this several times today, but Ive got a God Mod 180, and IPV3, and a Sigelei and the Sigelei 150 is easily my favorite. Very practical, easy to use, durable (with the free silicone case), and works quite well at preserving battery life and consistent voltage. The magnet back cover I petition should be a requirement on every box mod in the future (instead of the annoying as hell IPV3 screw cover), and the spring loaded pin and 510 connection ensures youll have both good contact with your atty and that the threads wont strip. Would absolutely recommend it