I just got the Atlantis 2 yesterday and absolutely love it. Love it even more than the Atlantis 1. I prefer both the Atlantis 1 and Atlantis 2 to the Subtank Mini (I have the Mini but it should be pretty much the same as the Nano) because the Atlantis tanks vapes a lot smoother than the Subtanks. It also vapes a lot cooler as well, even at higher wattages. I vape my Subtank Mini under 25 watts since any higher and the vape is too warm for my taste. With the Atlantis 1 and the stock 0.5 ohm coil, I vape at just under 35 watts. Above that and the vape starts warming up. With the larger air flow control on the Atlantis 2, I am using a pre-built nickel coil on a VS rDNA40 and I have it cranked to the mod's maximum wattage of 40 watts. Same tank on the SX Mini M Class and I can use it at that mod's maximum of 50 watts. The vape starts to get a bit warm at 50 watts, but then I can open up the air openings at the top of the tank and that cools it back down.
The Atlantis tanks, like other Aspire tanks, do vape a lot wetter, so the vapor will condense on the inside of the drip tip. And like Susan said, it will go through juice a lot faster than the Subtank, since I am vaping it at higher wattages.