All I can say is, this is one bad ass RDA. Machining is excellent, deep juice well, center post won't spin. Single or dual coil, non-adjustable air flow, but to me, it doesn't need it. Running in dual coil mode, the air flow is a slightly restricted open lung hit. The Bambino, and Tobh atty top caps all fit this as well. Works perfect on hybrid style mods, contact pin protrudes plenty. I use it on an smpl. Not prone to leaking as long as you don't grossly over drip. Running a .24 dual coil 24g and the flavor is excellent. 50 bucks for an authentic is a great value IMO.