The Provari won't make a bad delivery device make better vapor any more than it will make a bad tasting juice taste any better.
What it will do is provide you with dependable and consistant battery power better than any other APV on the market. Same output from the time you put a fresh battery in until you replace it, no drop off whatsoever.
It will be durable. It's not likely to break with a fall, or even suffer much damage being dropped from a speeding motorcycle onto the highway. That might not seem like it would be worth the extra money. But it depends upon your perspective. Allow me to explain.
Many people here go for the less expensive battery mods made in China. They do the same thing that the Provari does, maybe even more things. However, the quality of their parts and electronics are not of the quality of the Provari's. They have a lot of "bells & whistles" features that you may not ever use. But the defining moment of truth will be if, no when, that device breaks down. China-made mods are not repairable, you must consider them disposable. At their cost point, you may not care if you have to buy another mod every few months to replace the one that fell apart or stopped working.
Most people eventually get tired of that and begin searching for something that is more durably built, will survive anything but a lawn mower blade, and made by a company that will repair it for a reasonable cost after warranty for as long as you have it. Buy once, cry once...regret it. Never.
In other words, how long do you think you will be vaping? Are you going to wean yourself down and stop altogether? Or do you need a device that you can count on working day-in and day-out for the rest of your life? I'll probably be lying in my casket one day, holding one of my Provari's in my hand, same as when I was alive, with the blinking LED warning that the battery needs to be changed.