Since I'm new here, I might get some of the terminology wrong...sorry if I do...
I just bought a Volcano Lavatube and an Aspire Nautilus 5ml Tank. I moved up from a KR808 type from V2cigs with a refillable cartridge. I was having to refill the cart and change batteries every hour. I did this for about 2 years. I finally broke down and got something I think I am really going to like...I have only had it 1 day, but besides fiddling around with it and taking it apart, etc., it seems like I am using less e-liguid that I was using before with a better effect. I would have thought I would have gone through more with this mod and tank. I am still figuring things out though.