Until you build a mech mod and sub-ohm that Kayfun.
ProVaris are nice, but there comes a point where you've got to ask "Am I spending money just for the sake of spending money?" Take a ProVari with a Kayfun and a $50 Hcigar Nemesis clone with the same Kayfun and you can only sub ohm on that Nemesis. You won't be blowing massive dragon clouds without sub ohming.
Obviously mech mods aren't for everyone. If you aren't using an RBA like a Kayfun or you like to change voltage a lot then a VV mod like the MVP 2 is wonderful. But, if you find you settle on a single voltage setting all of the time or if you're using RBAs then you're probably better off with a mech mod, and possibly a Kick. The Kick will hold a stable voltage and you control your wattage with your coil. Lower ohm increases wattage.
Take the Kick off and you can sub ohm until you're blowing massive dragon clouds, although you look very cool doing them in your pic.
It took a while, but I've finally convinced my wife to make the change to a mech mod and she loves it. She had an Innokin SVD but she never really used the variable voltage aspect. She just liked the fact that it had a big 18650 battery and lasted a couple of days on a single charge. I finally managed to get her to try a Nemesis with a Kick. Same 18650 battery, same iClear 30S tank on top. Dialed in the coil to match her SVD voltage setting and that's all it took. She loves the fact that it lasts almost the same amount of time as the SVD on a single charge, had consistent vape power beginning to end, and is only half the size of her SVD which makes it a lot easier for her to carry around.
The only thing she doesn't like is the bottom fire button. Guess our next mod is going to be a Roller.