One tank. Untold options. Coils from the Atlantis, Subtank, Delta 2, with more on the way can be used with this. I've personally never tried an Atlantis coil before so this might be the time. This also lends me to think that it should hold the rba sections for each tank, right? As new coils are produced for newer tanks, this should give me the option to get the benefits of the coil without spending more on a new tank and reducing the risk of not liking the purchase and just looking at my money sitting on a shelf. What if this is the future of sub ohming? I believe it is. I see a future where we have .003 coils that can run at 200 watts on a 600 mah battery for 3 days. I picture mods that signal when fluid is running low like my car does when I'm low on gas. I'm excited and you should be too. Grab some sunglasses folks because the future looks bright.