I've been doing twisted parallel builds lately and really been digging them. My initial concern with this type of build was that my wick wouldn't be able to keep up with such a long beefy coil. Literally no issues as far as burnt hits, dry spots, etc. with rayon. I can vape my RDAs to where the wick is literally bone dry with no problems. I'm kind of surprised that cotton still seems to be the more popular wicking material in the general vaping world. I find rayon to be superior in every way, better, more consistent wicking action, cleaner flavor, easier to work with, lasts longer, and it's cheaper. I haven't even thought about cotton since I made the switch to rayon.