I ordered just one 1.5ohm, just to see if it lived up to the hype... wow. This thing has totally ruined me, as far as enjoying my old CE2 tanks that I loved so dearly. Amazing balance of flavor and TH - usually it's one or the other - and what a lovely warm vape even at 3.7.
I'm surprised to hear people talking about weeks of use without cleaning though. I started feeling unimpressed with its performance after about 5 days of use (granted, I'm a heavy vaper, 100% VG). BUT... a quick cleaning, and BAM. vaped like new again.
All I do to clean, is run under hot water (for a good while), blow out thorougly, then run under some more hot water, blow out again - then I stuck it in the diffuser of my wife's hair dryer, and run hot air over it for 5 minutes to eliminate any residual water. Then dry burn many times till the coils light up quickly, blow it out one last time, and its good to go (of course, wait till it cools down for that last blow-out, or you'll freaking burn your lips off - haha). I don't know if thats the recommended method - possibly not - but it has worked very well for me... and have done this twice already - each time, it fires up like a champ.
I was a loyal CE2 guy for a LONG time - always felt like they gave the best flavor. Most dual-coil cartomizers I tried had great TH, but most seemed to give TH at the cost of flavor... These are the best of both worlds. Only problem for me now, is what am I supposed to do now with my stockpile of CE2's?!?! haha