Funny how it goes. I waited a long time to get a ProVari. I finally bought one in 2014, just months before I got my iStick. The iStick became my daily driver and ProVari landed in a drawer. I loved everything about my iStick--form factor, the extended lip that accommodates larger diameter atties (no more beauty rings), the simple button to change wattage (no more round robin), and variable wattage!
The problem with ProVari was that it was designed to be used with cartomizers--by the time I got mine, nobody used cartomizers anymore.