Here are my 2 cents on the V5...keep in mind this is from a n00b perspective since I only started re-building less than two weeks ago (Lemo), and this is my first attempt at dual coils.
I don't know if you'er supposed to aim for a certain range with dual-coils, but I ended up with a 1ohm build using 28g Kanthal. Do vapers mostly sub-ohm with duals? When I first dry-burned it, it seemed a bit slow heating up. I was firing it at 12 watts...is that too low?
Anyway, I kept it and proceeded to fill it. And by 'fill' I mean 'dump half of my juice onto the counter'. Man this thing leaks. Yes, I read the whole thread and have seen all the suggestions now, but it all seems kinda pointless when there are other options out there. Some of you have gotten the hang of this, so that gives me hope.
When I vaped it, I was underwhelmed (compared to the Lemo). In fairness, my first Lemo build had to be ripped out and buried in a non-disclosed landfill, the second was good, and on the third I nailed it. I'll keep this for a couple of days, then try another build. It's not bad really, and maybe it will break in.
Also, this thing is noisy! I like to keep the airflow wide open...could that be the reason? Speaking of the AFC ring, I can't get it to move now! It's completely stuck (until I take the whole thing apart, I guess).
Lastly, I thought the wicking was a pain. I think I used the correct amount since I'm not getting dry hits or flooding, but it was a pain (for me) cutting them to the proper size...or, maybe I need better scissors.
PS: I think it looks and feels good for the price (I played $28.50)