After reading through the discussion here from after I fell asleep, I have a few things to add. I would multi-quote but I'm on my iPad and its a PITA so here it is in no specific order.
As far as clone vs high end atties, I have both and can tell you that you can get a great vape from both, it's all in the build. However the high end rebuildables are of a much better quality and tend to be easier to set up correctly. I get a great vape from an AGA but the top coil hot spot can be a bugger. The real DID, IMHO, is the best you can get for top quality machining, durability, ease of set up and all around good looks. I think it was the best vaping investment I have made and have since picked up another.
On mech vs vv, I love mech mods, makes set up a breeze and they are bullet proof. You can throw them in the bathtub ( I am not recommending trying this), dry them off and they are ready to go. I learned to build on my Provari and although it can be finicky if you have any shorts at all, it is convenient for checking resistance. I have gone as low as .9 ohms on the Provari but usually build it out to about 1.1 because at .9 if it drifts at all it will error on you.
I love 500 SS tight wicks for tilt free vaping, 635 even more so but have been experimenting with FC200 type ceramic wicks and ribbon Kanthal and love where that is going.
Sorry for running on, the best thing about RBAs, as mentioned already, is being able to fine tune and chase the elusive perfect vape.