I use 4
dna-20/30 box mods as my all day
vaping.
I am looking to get a 26550 mech
mod, but only because the form factor is similar to The Shield.
Tube mech's do nothing for me, as a tube is a tube imo, only so much 'tweaking' you can do. But I agree they have their place, sub-ohming for starters.