That was the vid I embedded in the first post. I wish he had removed the coil so we could see the holes for the leads though...
Oops, my ancient phone is slow to load, it hadn't even displayed an embedded vid by the time I scrolled past... He really seemed quite fond of it, and it looked well made!
I'm not very experienced with rtas, I don't even have one, nor have I built anything single coil, my rdas are either dual coil or ones that you cut off one sides airflow to use for single, something about that style makes me think it would be a poor representation of what single coil is really like...
I've not had any complaints with my dual coil builds, obviously it's twice the wire and atleast twice the work to use, but I've enjoyed them in dual mode.
I've also read of several single coil users trying duals for first time and commenting how much more they liked it and wouldn't be going back...
That said, it would clearly depend on your build and design of the rda/rta as to how they perform.
I'm only 4 months cig free, and pretty strapped for cash. So my gear and experience is pretty limited compared to lots of folks, on the other hand, my rule is to spend no more than my cig budget on vape gear... Me and the wife together smoked about 3 packs a day. That's expensive! So it does give me plenty to play with, no complaints... I'm sure in time I'll have more gear than I know what to do with... I'm already pushing it in some aspects.