Jeez! What a thread!
I still don't know where the misconception that you have to use RBA's on a mechanical came from? I have a BB and just bought a Legacy, as well as a tin mod, no VV or VW in any of them, and use them with splendor, dripping atty's, carto tanks or otherwise! You just have to know what you are doing when you order atty's for them. We used to HAVE to do this back in the day! It's still very possible to do today, I wish this misrepresentation would stop!
The REO is a great mod, I would like to have one of my own sometime! Very durable, rugged and well built! Get an I06 from Ikenvape, a Ciscco or HH357 dripping atty for it and be happy.
The Provari is a tank! Plain and simple! If you can find something more durable and rugged, buy it! But I doubt you will! I don't know why everyone thinks the single button is so complicated, unless they've never used it! It sounds hard, but really is intuitive and simple in use. Much easier to use than a Zmax. My buddy got a Zmax, two weeks later we are still trying to understand the menu, I had the Provari down in a day!
The DNA20, meh. Played with it, helped design a mod to compete with Provari out of one. First problem, it was a box, second, it was made of alum. Yes, it works well, but I didn't see any benefit above the Provari with it. It was too big, it was too heavy and just not marketable unfortunately. S really neat design, but too complicated and big to work.
What is going to work for the OP? I've no idea! Hell, that's half the fun of it, finding what works best for you! It's not as easy as going down to the store and grabbing a pack of smokes!