Speaking personally...
While I love my ProVari, I've found that I really like using tanks. No leaks, easy to see when you need to refill, and with a Boge carto, I don't have to tip my device when the juice level is getting low, to make sure I don't get a burnt draw!
That being said, when I put a tank on my ProVari, it is long! Almost too long to carry around in a shirt pocket, and I'm not comfortable with putting it in my pants pocket, with a tank on top.
For that reason, about a month ago I purchased a MadVapes VV box mod, with indicator. Inexpensive, but it works great! AND... it goes in my shirt pocket, even with a tank on top, and isn't much taller then a pack of cigarettes, and it's lighter and narrower.
When I began vapping, over two years ago, I wanted something that LOOKED like an analog cigarette! I went with an eGo.
Shortly thereafter, I realized I'm NOT smoking an analog, and don't want/need it to LOOK like an analog cig.
Since getting my MadVapes box, I've now ordered a beautiful, variable voltage box mod made from walnut, and another box mod.
There's just something about holding a handcrafted, stained and lacquered wood mod! There's something beautiful about it! There's also something about HOLDING It! I find it much more comfortable to hold then a tube, but again, that's me.
If I like 'em as much as I think I will (had an Ali'i which I loved, but it wasn't a variable voltage device, currently a "must have" for me), my ProVari may soon be in the classifieds.