Some vendors say ss, others chromed brass.
Perhaps a combination of both? Or a lesser ss alloy? I actually don't care because I like them...
Do you mean replaceable coils? I'm not sure they are kanthal--I think they are actually Nichrome. Most likely. Depends on the juice. You (your partner) can always dilute the juice by adding a drop or two of distilled water per ml to achieve better viscosity. It's all about viscosity of the
e-liquid, not just VG percentage.
AFAIK, no. And even if it could, I wouldn't do it. You may get leaks and other problems.
IMHO, it's much better. But you know what they say--taste is subjective. Eleaf mkes 3 kinds of coils that will work with the iStick 40: original dual coils (1.5 Ω, silica wick), cotton vertical coils (1.2Ω), and TC coils.
Favorably.
They are airier, but both GS Air tanks and Subtank mini V2 come with adjustable airflow. GS tanks and coils are also much more economical.
Yes, yes and yes.
Good luck.