Zapper...I've used the Tornado tank from TW since it came out. . Very pleased with it.... The atties died on me very quickly in the first 2 weeks,. but since then I've learned that when they are under performing I give them a boil wash and then rotate them in use... I'm getting more life out of them now...I've only been vaping since January and started with a 510, and I find the tank a lot better than that, and I don't miss all that fluffing about I used to have with the 510...
The Tank isn't perfect but I doubt there's anything better out there for my needs... They have just brought out a new LR atty for the tank, but I haven't tried one yet. They're getting rave reviews over on the TW forum...
Tornado do the mega batteries for it. They also lowered their prices on all Tank stuff last week..