I think the most complained about feature is the one-button menu function. I don't mind it, it only took me about 10 minutes to master it. But there have been numerous times when the feature that I want scrolls by and I have to round robin around to it again.
Since I use only carto tanks with the same ohm carto, the lack of a variable wattage feature doesn't faze me in the least. I do adjust my voltage according to the flavor that I'm currently vaping, but variable wattage would not help in that regard.
The regular size with the extension cap is pretty hefty, and I had a Silver Bullet prior to the Provari. I'm not really complaining about that either, as it is a testament to the quality of materials used and it's implied durability. It had been my all day, everyday device for several months when I decided I needed something of smaller size and lighter weight for short trips out-and-about. The extended Provari is not really pocket-worthy in my opinion. It's too heavy and clunky to be used in a lanyard (Serenity Gear) and I'm not sure if I would use a belt holster for it.
I began toting my 14500 BB with me on short runs out to the store and loved its small size and light weight. Sure would be nice to have that in variable voltage. I strongly considered getting a Mini Provari (and likely will reward myself with one on my 1-year vapor anniversary), but I couldn't justify another $200 + batteries at the current time.
I looked at the reviews for the few 14500 battery variable voltage devices currently available, but that battery is just too small to do V.V. justice. I settled on the Smoktech V.V. Gripper, which suits my purpose until I save up enough for the Mini in the Spring. It just so happens to use the same batteries as the extended Provari, so that was a win-win.
I would like to see a red Provari produced.