I don't use the kayfun but I do own 1 kayfun, and a Russian 91. So does my sister. I mainly build on them for my family. I use mine to test and use theirs for the final build. But if I want a simple night with a high pg juice...I'll enjoy. I run so far parallel and double shotty builds according to what they like. But I am interested to know if I could run titanium in these? I tried 24g ss....the screws won't bite, but 26g does. I think...I can run tc but I want to know if it's worth it? Mainly to mess around. Also, my sister's russian 91 is missing the insulator, what can I do to redneck it? Now for the dark horse mini, I am happy with it, but hate it....I am running the claptons that came with my tfv8, and juice is harsh, I do,admit I run 8-12 nic in my juice. Perhaps this is the only reason? It's fine in my tfv8, so I don't buy Juice to Taylor to different tanks. Is that the difference? Or should I ask what kinda coil to run in t? How about the it annum.I have? I also have 24g ss...seems to run hot. Also, what recommendations is there for a subtank mini rba? I am unsatisfied so far with all builds I've tested in it. Runs hot spits or socks in vapor. I do better with my tfv8, and kayfun then this guy.