I've had my ProVari for over a year, and love it. It's dependable, battery lasts a long time, and solidly built. I've dropped it on concrete a few times, and other then minor scratches, it's held up.
That being said, I have found it not the most pocket friendly. If I'm leaving the house, and put a tank on top of my ProVari, it's pretty long in my shirt pocket, and on the heavy side! (I really much prefer carto tanks... dripping it too much of a hassle, and refilling cartos is also a pain) With a tank on top, I'm not going to stick the ProVari in my pants pocket.
Recently purchased an inexpensive MadVapes VV box mod with Indicator. Works great! Provides the same excellent vap I get from my ProVari, and the two 14500's will last most days. If I know I'm going to be gone from, say, 7am until 9-10pm, I simply carry a spare pair of 14500's with me... they're lightweight, and easy to stick in my pocket.
I've now ordered a more expensive, wood variable voltage device. I've decided that it's just easier to carry around when I'm out and about. Ordered the Gepetto VV, shown in my avatar.
The Gepetto changes voltage much like the ProVari... three presses of the button, you're in voltage up mod. Press once to increase voltage .1v. Also has built in voltage display, and displays remaining battery life, among other features.
Everyone's needs are different, but what's great is the enormous selection of mods now available!
Good luck!