At the end of the day, people are for and against a Provari, just like anything else.
However, when pbusardo was asked what he would vape if limited to only one setup, it was a ProVari with a Kayfun.
That's a guy that has access to pretty much anything he wants to vape.
About the only thing it isn't good for is sub ohming. Although, I run mine with a .85-.95 coil in my Russian and 2.9 volts. Produces prodigious vapor, great flavor, every time.
As for the VW function...well, I have a Semovar for just that.
Personally, I found no real use for it. I like to vape different juices, and most of them take a different wattage level to vape to my taste. If you had the same flavor in many tanks, VW would be great though.