pro vari's are excellent tube mods. they're well built, pretty much indestructible, and accurate as hell. the customer service is excellent, and you can get an extended warranty that will pretty much cover you for 2 years. it's compatible with almost everything you can think of as far as tanks, cartos, etc. i've had mine for over a year, and with a bit of maintenance (very minimal-like q tip swabbing the connection), it works just as good as the day it came in the mail. being new to vaping, you may be overwhelmed with the choices you have. i waited until i was 3 months smoke free and knew i was in this vaping game for good to buy mine, because it is a hefty investment. i'm glad i did it. i use it every day, like a tool. yes, there are cheaper ways to go, and being new you've got to ask yourself if it's worth the initial investment at this point.
sure, there are other devices out there that do (ALMOST) the same thing (ALMOST) as well as the provari, and some do even more (variable wattage). in the end, you've got to ask yourself if it's worth the money to have a reliable device you can depend on for years, or if you still want to explore what the market has to offer. i started off with 2 ego twist batteries, and i still use them from time to time. i love them. i also own a boatload of other pv's aside from the provari, but that's because i'm out of my mind when it comes to my vape stuff...lol
as far as the one button thing goes-all you should need once you find your sweet spot is that one button-you'll get used to the functionality very quickly. that's part of the beauty of it-the simplicity. my advice is to see if it's worth getting into variable voltage in the first place for you-grab a couple of ego twists or vision spinners, a decent cartomizer tank, and some cartomizers. play around with that, and if you decide you like the flexibility, then go for the provari.
does this rambling post help you at all? lol