I have the Atlantis already! That came in monday but I got tied up before I could crank it up fully to the max on the iTaste VTR that is! I had it first on an old aluminum tube mod when the first coil wouldn't fire and then at 7w when the button stuck DOA tube mod! I got back to tuesday night and cranked it with the spare coil and was finding at 7w-12w running it at the smallest air hole provided the best flavor.
It takes a few second longer then other tanks to heat up however. At 15w I put out a few small clouds and was able to open it to the largest air hole which actually fills the slot on the adjustment ring. Great vape but the Nautilus puts out a larger cloud every time at 10w! The Atlantis is better off on the 20w or higher mods where you can turn it up! The Nautilus on the other hand works as well on a Vamo as well as the VTR or MVP.
I found one vendor who tosses in an extra pair of spare coils with each tank ordered and went back for two more for the pair of SMOK ACE mods giving me a total of 5 of those. The spare coils for the Atlantis however are still on pre-order status with only a few vendors even having those instock. The same goes for the SMOK Guardian E-Pipe II mod where the vendor Smokstore.us obviously just another vendor in Hong Kong as is Fast Tech showed instock while the only vendor with any in stock is a Canadian vendor at the moment!
That suggests the vendor orders are being filled a bit slower this year over what was seen last year during the November-Black Friday-holiday specials! 2014 hardwares were out in late October! The most likely reason of course is the drastic increase of vapers in just one year's time alone!
One highly recommended tip for sub ohming if you get into it is using high drain unprotected batteries in an advanced regulated mod not a mech mod! The protection circuits will protect the mod and you from mishaps! The Nautilus however is actually the best flavor wise since it comes across more intense and still puts the vapor out.
Here' a quick look at both tanks in use with the Atlantis on the VTR to the left and Nautilus at the right on the MVP2.0. http://i59.tinypic.com/1z2zsch.jpg
As you can see the buy at one vendor in particular was a rare find for not only the two extra coils but the glass replacement for the tank section of the Nautilus as well.