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If the coil looks good, try it first. Then you'll have a benchmark to judge against when you build your own.
The clone genesis I just got came ready built and it has a loose upper turn on its coil. I'll fix that before I try it.
Just for info (bubblegum)....
I wrap 6 times around a thin drill bit (or nail) and attach the two ends to the posts in the Octopus.
Then, I test it on the meter and glow it a few times. Then roll up the cotton wool, slide it in (tight) and drip!!
FastTech is a wonderful resource, but not fast. Expect to wait well over a month for your stuff:
In my case...
Ordered: Jan 7th
Shipped: Jan 15th
Went Overseas: Jan 17th
Arrived in UK: Feb 15th
Delivered: some time before Feb 23rd
Also lot of the stuff is cloned and may be sub-standard. It is very much caveat emptor.
I recently went from clearomizers to RBA's myself. I bought a Hcigar Nemesis and Kayfun 3.1 and love them! I gave away all my clearomizers to a friend lol.
I had 22 iSmoka BCC Mini's, 4 Protanks, 2 Protanks 2's and 11 CE4/5 style clearo's. The money I spent on new heads for all of them I could have bought about 10+ Kayfuns lol.
I can't recommend Kayfuns enough to you, they really are first class.
For tanks, I recommend all the iClear 30 range although they have a new one the x.1 which I've heard is also good, otherwise try the Kanger Aerotank & the Aspire Natilus ( a big tank ), leaking is usually down to the atomiser not being screwed in tight enough, I've only had one problem of leaking so far, and that was with an unknown maker Hypertank, but once I had tightened down the atomiser it is now fine.