I like the Kanger bottom coil systems (Protank I, II & EVOD) rebuilt with a semi-micro coil and cotton wick. I get amazing flavor and vapor from these device from the first hit to the last. Another item to consider that I don't read much mention of is cross-contamination. Keep your equipment as clean as you can without obsessing over it. Wash and thoroughly dry your your hands before refills. Don't make direct skin contact with any piece of hardware that will come in contact with juice meant to be vaped. I'm talking about coils, tank-threads and wicks. I can tell when I've contaminated my device and juice almost immediately. Also, make sure your device is properly primed before taking a vape. ...especially your first. If you burn your wick or filler material you'll permanently ruin the flavor of the juice until the burnt item is removed and the device cleaned.