What is that one very important feature? for me the Provari does sound great on paper on every single aspect except for the !#$%ing single button navigation. I simply can't do it, I have a zmax that I have tried to use, but I find myself whipping out the manual or a copy of it on my iPod every time.
Variable power.
Say you've found your sweet spot for a particular juice - it's tasting great but you want to try it on a different vaporiser device or you have to because there's a problem:
With variable volts when swapping atomisers, you look at your volts, then you look at your resistance. volts^2/ohms = watts. You then switch atomisers and check the resistance. Volts= sqroot(wattsxohms). You then set the new volts and commence vaping.
With variable wattage you just switch atomisers and continue vaping.
Yes it's that simple. Variable power setting means the device makes the adjustments according to the power that you select to vape your juice at and the resistance of the coil that you are currently using.
Provape have said that they are not going to update the Provari with variable power. Fair enough - I also run some VV only devices and I'm happy with them. They only cost $20 though. ;-)