Aromamizer. Best flavor (works more like a RBA than traditional RTA), 2 different style rebuildable decks (both bigger than most RTA's I've seen, and the only one with a velocity style deck that i know of), prebuilt kanthal and TC NI heads available, going from a 3 ml tank to a 6 mil tank (or vice versa) is as simple as changing 1 piece top cap, I have not had one leak with constant use since i got it (have used both decks and the pre built replaceable heads), large adjustable airflow (although not the biggest fan of the bands, they work well), and very solid machining.