I have used Fluxomizers, got vapes smart carts and the ego tank, as far as vapor is concerned, the smart carts are best, fluxos are kind of light in the vapor dept i was using 3.0s, and i dont like the ego tank, tooooo hard to puff on, but the ego mega atty and mega cart kicks ...., massive vapor, taste and holds around 2 ml, stopped counting at 30 drops refilling a mega cart, the smart cart is the same principal as the tank but very nice draw, i gotta say i did not care for the fluxomizers, light airy draw, decent flavor, but very light vapor, also the tube is not affixed to the base, if you bend it slightly u have juice all over you as it comes off the base...any que pls pm me....forgot to mention none of the 3 above leaked in any way, to be fair i tend to use a lot of vg in my juice....also the wicking material in the smart carts is a little dense, difficult wicking, i replaced it with the blue marineland material and they do great....