Well, I was thinking that one thing that kind of throws me is the variable voltage.
The ProVari can be adjusted from 2.9 - 6.0 volts in 0.1 volt increments.
The ProVari’s variable voltage settings include:
2.9, 3.0, 3.1, 3.2, 3.3, 3.4, 3.5, 3.6, 3.7, 3.8, 3.9, 4.0, 4.1, 4.2, 4.3, 4.4, 4.5, 4.6, 4.7, 4.8, 4.9, 5.0, 5.1, 5.2, 5.3, 5.4, 5.5, 5.6, 5.7, 5.8, 5.9 and 6.0 volts.
Okay, it is variable but does the variable part mean that only certain juice delivery systems will work on the Provari? Do you just use the Provari at 3.7 if you want to use a Smokeless Image carto with an adapter on the Provari? That sort of thing.
And technically, I haven't quite quit smoking. I still smoke a few a day. I was thinking that it is somewhat of a security issue for me. If I don't feel secure about my juice delivery system, my batteries, my back ups and such, I may just keep smoking a few

I know that won't make sense to some people but that is what I was thinking. If I get a vape unit and juice delivery system I like and I have the X2's for back up and my cig-a-likes for going out with, I might finally give up those last few cigs.
I took up DIY on juice so that I could always have plenty of juice on hand for a much better price. Ordering juice and getting the right mg level - problem solved. I don't have to have 12 mg, 18 mg and 24 mg in three or more flavors and reorder on time. I just make it myself at whatever mg I feel is appropriate.