Just got my first pack of these cartomizers today. I've never been a fan of cartos, mainly because I didn't like the semi-disposable aspect of them. However, these kept coming up with high marks so I thought I'd try them. And boy am I glad I did. Nice, warm, copious vapour, great TH, and good flavour. The flavour wasn't quite as intense as I was expecting, though maybe my expectations were a little too high from a couple of bad (evidently too-low resistance) B-type eGo-T atomizers that produced intense flavour but only lasted a couple of days before they burned the wicks to stubs.
At any rate, what I really appreciate about this carto is the design. The vertically-aligned dual coil design allows liquid to completely surround the coil producing a consistently great vape. As far as I'm concerned, all atomizers should be designed this way. I'd still like to try the Echo cartos for their alleged longevity and same vertically-aligned coil (though only a single coil) but at this particular moment, I think this carto has spoiled me for all the other atomizers I have tried so far. Plus, they're inexpensive enough that if a 5-pack lasts me 3 months it'll have been more than worth it.
My only concern is that despite SmokTech stating that these do work on eGo batteries (I've only just started on this first carto tonight), I'm worried that they might not last long. I'm going to have to consider a higher end true 3.7v solution, though I really have no idea where to start, at least not without paying huge money for an 18650-based system.