I like the top air flow, less leaks. Device is IP67 rated, locking switch is nice, battery door is a pain to put on but a little oil on the threads or something helps. I like 21700 mods more but this is fine too. Very compact, I recommend over voopoo, you get better coil selections, a better tank, better device. Unless you want to use nic salts, the E100 is a solid choice. Very nice compact sub ohm kit. Do i recommend over a single battery mod and tank? I would say it depends, if you have a top tier tank like the falcon, tfv18, crown 4, or Zeus, then no it’s not as good, not to say they’re that much better. Each has pros and cons. Definitely recommend.