I use the eleaf, the aspire et-s bvc glass tanks, adapter thingies to engage the eleaf to the tank, and those are all I need. I don't even want to try other things because a new kind of tank means a new kind of coil, more buying, more hoarding, and what I use now works beautifully and reliably in a non-banned environment, travels well, so I won't mess with it.
For the future banned environment, what I hoard is that which is my minimum set-up, still the aspire et-s and loads of coils, the adapter thingies, and plastic bolt mods, which have about disappeared from the market now, but were plentiful and cheap at one time. They use a single externally purchased battery, are vented, all safe.
Though the plastic bolt mod is scarce now, there is a brushed aluminum variety of the same thing, in basic colors and pretty colors, still plentiful, a little more expensive than the plastic was, but relatively moderately priced.
I also have an authentic original kato hammer, with serial number etched on, but it's a show piece. I don't want to use it.