Sorry for old quote...
Anyway, I just wanted to add that i've also talked to them, and so just for others e.g. reading the above, then it's a problem with some mods and with other mods there are both good and bad so it's a russian roulete as they describe themselves, but not ALL are bad... Djlsb also rarely have resistance issues when checking his prototypes...
What i'm specifically talking about is the primo v1 and v2... I asked which dual-cell mod they recommended to work best, and they stated the primo v1 was good for one of the devs and the primo v2 was good for another dev. They stated often the silver version worked better, though could be by chance of course...
I have a new updated predator with new 510 that cannot fall out and with AF it's crazy smooth in TC and the curve is very close to DNA smoothness! Yet, the new predators also have an issue with common grounding at the bottom, but I seem to have been lucky. Also they stated that yes we see alot of issues with joytech/wismec/eleaf, but they are also market-leaders, or atleast one of them, so we should think in relative terms too i.e. how many good between how many bad...
I'm personally willing to take the chance with wismec/joytech/eleaf, because they are so cheap and if they do work, then you have scored gold in having a good mod with all that AF has to offer you i.e. a DNA lite/budget experience
(One I read actually thought AF with proper PI regulation was smoother than DNA, though only on simple non esotic coils...)
Btw, Daniel from djlsb also uses oscilloscope when testing and the predator v1 was very smooth too on TC, so I don't see how you can say as a fact that predator is crap on TC... Yours was crap on TC... Also you say e.g. smok can't do TC? What about the osub's TC curve on daniels review... Some devices fail obviously, but we cannot really generalize imho... No disrespect meant btw