Well I guess I'll chime in here on my experience with the Subtank Mini. I picked up the ST a couple days ago and unlike the vast majority of folks here, I found it to be a dreadful vape for me. I washed it out and its now dried and I may pack it away.
I tried vaping it numerous times with the installed OCC. I'm a mouth-to-lung vaper only and had to use about a half an air hole to get the draw to my liking, and between 13-15 watts. For my style of vaping, the juice takes too long to start cooking and the vaper was weak in density and harsh on my throat. I've vaped the same juice in all my tanks for many months, and in the SB it had a bit of a raunchy taste. I did thoroughly wash the tank parts before first using, which I do with all my tanks, and carefully primed the coil prior to filling, but the vapor and flavour was nowhere near as good as any of my numerous other tanks.
I also have the Smok VCT with the X2 .4ohm dual coil and it vapes and tastes sooo much better. The Smok still takes as long to cook my juice but then the vapor comes through smooth and full, and is totally silent with no popping and easy on my throat. The ST pops loudly with every vape and is just not pleasant in any way. Maybe it was a duff coil - I don't know, but its weird that my experience is totally different than everybody else'.
I won't give up on it until I try the RBA or wrap a 32 awg at a midrange resitance, say a 1.5 - 2ohm; more suitable for MTL.