10, I think, or maybe 11 if i count an ARO Winder that still seems to work.
2 iStick 30w
2 Sigelei Zmax
1 Vamo v2
3 iTaste vv3
1 Fallen Angel (mech)
1 Smoktech Galileo (mech)
1 ARO Winder (Ego-style)
Yep, 11. Why? Backups for my backups' backup. And because all except the iSticks and one of the Zmaxs is a year old, +/- a month or two either way, and electronics are not immortal. The mechs are for Vapocalypse prep; I prefer the regulated mods, but I've used the mechs enough to be comfortable with their use and care. Oh, and I still have all the parts and pieces to assemble 2 complete eRolls, and one PCC for it.
If you use vaping in order to quit smoking and/or stay quit, you cannot afford to have only one vape setup, because electronics are fallible, batteries are fallible, atomizers are fallible, people are fallible, and the USPS is fallible. Vaping must always be easier than going to get cigarettes -- if you're really serious about abstaining from smoking.
Andria