So you still don't know about the
vaporesso veco, smok x-TFV8 x-baby w/ RBA coil, and the cubis pro mini, and so many more tanks that can sub-ohm, TC, and also be fitted with ceramic coil heads of some sort? (and also not leak!)
Or are you just arbitrarily limiting your comments to cover smaller sized, small diameter, around ~1ml tanks specifically intended for cannabis concentrates and not talking about e-cig style RTAs that are around 2ml and larger without saying that? Because I'm nearly falling down, tripping, stumbling across all these new e-cig tanks that also work great for cannabis concentrates. 2-3 years ago, there were very few tanks that can TC, not leak, and could have ceramic heaters, now there are many. With co2 oil and distillate on the tanks I've mentioned, it's not even really necessary to dilute your concentrate with terpenes, PEG, etc because there's sufficient room and airflow and wicking holes for the oil to move.
You tend to use mods, not unregulated pens, right? So I figure this would be right up your alley?
Little 1ml sized tanks look quite odd and
conspicuous 
with a mod, even on tiny mods like an evic basic. Almost nobody uses that type of gear to vape nic juice these days, it's all RTA/RDA.
For me, the bottom airflow and leak-prone design disqualify the vape710 & trinity tanks, although the flavor & vapor from the sub-ohm ceramic wick is probably nice. I'm pretty sure the extra airflow and wicking potential of some of the RTAs I mentioned easily put the trinity to shame in the field of TC cloud production with similar vapor quality, with the potential trade-off of spitting possibility in some cases.
I think more mods made in 2016/2017 stopped including the vented 510 connector because the kind of tanks and RDAs that people actually use with mods today have pretty much stopped using bottom airflow through the 510 connector because it is so inherently leak prone and a poor design feature. Leaking juice through the 510 pin can foul mods to the point of destroying them with prolonged use/leaking.
Only leaky little tanks that are intended for cannabis oils use bottom-510 threaded air flow these days, and although most RTAs still use bottom-airflow, it is now separated from the 510 connector through a separate bottom air throttle / coil assembly, so your oil or e-juice eventually floods / leaks internally into a metal coil/air assembly, not into the mod itself.
The whole market for e-cig RTAs, and even the far-inferior-quality type of tanks for concentrates that the industry has forced upon us for so long is slowly transitioning to top-airflow because it is so much less prone to leaking, and that's long overdue and welcome, IMO.
Leaking e-juice is an annoyance, pennies at a time, leaking cannabis concentrate from a tank is a small tragedy, shedding dollars at a time.
Unacceptable. You'd don't have to accept leakage, people. Use top-air.
