I kind of sat back and studied the Genesis style RBA's from the back row for a couple of months before settling on the AGA Tiamat plus from Discount Vapors for $30. It was the glass tank included that finally got me to press the "confirm order" button.
I looked on the rebuildables in an intimidated fashion, too. I like things to work right out of the box; not a tinkerer at all. That's why I like my cartotanks, I found a method that works great for me and there is no tinker involved anymore. But I wanted to have a rebuildable in my possession just to play around with, to see what all the fuss was about.
It took me about two weeks (4-5 actual hours) to actually get it up and running, but a good week of that was waiting on more wire to arrive as my first coil broke while fiddling with it, and the remainder wire from the kit looked too wonky to try to mess with.
The hardest part is definitely making a small enough wick from the SS mesh. The wick hole in the AGA is really small, and at first you think no way can you roll a steel mesh that small of a diameter. But, it CAN be done.
My first coil ended up being 1.5 ohm. The Provari proved invaluable with this in determining the ohm rating and finding shorts that aren't apparent visably. It can see what you can't, and lets you know there's a short somewhere by giving an error message. Takes a lot of fiddling to find shorts in the coil, but with patience you find and fix them.
I made my second coil the other night. I wanted to try a higher ohm coil. This turned out to be 2.0 ohm. So far the vapor is less than the first, and no change in the flavor end. So far I'm disappointed in the flavor of mine, not up to par with my cartotanks yet. But I'm still in the learning phase and I can see great potential once I get this all figured out.
Watching the Zen demo from the Provape website is really helpful, and there were several videos specifically for the AGA on YouTube that helped me. Definitely read up first to get an idea of what is involved; but this is not rocket science as they say and if you make the committment to use one, you can do it. If I can do it, you can too.
Hope that helps some.