I'll be blunt..why are spending so much on tester?...there are tons of APVs that can accept 510 connection (drippers, Kanger Pro tanks) that does what you need...Innokin SVD, Vamo V5, VMAX, Siegeli stuff.....guess what they are pretty much do the same things you want, the same technology...
Yes people swear by Provari...but it's only variable voltage..but reliable and stable variable voltage. Would I get one..maybe....I rather save up for DNA30 Hana mod...
What I did was go on youtube..and see how things are demo..how to navigate through the menu, clicky buttons,construction, were screw threads buttery smooth or just crappy...what were the negatives and pros....
Please avoid reviewers...that all they talk about is "wow..she vapes like crazy...look at casper the ghost coming out this."
You want reviewers who will tell you everything, quality build, tight draws..worth the cost etc?
Then research ohm resistance, coil building, etc...take your time....it's not like the prices are falling anytime soon..on Provari or lavatube...
One of my biggest regrets was not coming to this board sooner and getting sound, reasonable advice..i did everything through trial and error and some great youtube videos and some BS ones.