I found the kanger horizontal coil cartos to do well. I use strong flavors and e juice that has throat hit. Unless you are dripping or bottom feeding an atty the flavor and throat hit is most often the thing you loose. But I like automatic e cigs sometimes. Got started with them using eRoll, which, btw, are great flavor and throat hit and throw in pocket? But I have to try other things. The Volt, the 5 volt and 3.7 passthroughs with no battery and the automatic Zeus 5 volt. I'm still figuring out cartos and Atties too for these 808 devices and because of the improvements made with the Zeus specifically that little leaking problem that killed auto batteries before is gone so dripping is fine. I drip cartos for blast of flavor. It helps. But so does using stronger flavors and throat hit. Cartos get a bad rap but there are ways to make them work more satisfactorily and the horizontal coil is part of that in the Kangers