Got some today and tried it.
Pros
- Wicks great! Used it on a dripper deck (to see it in action). I can tell the juice flow within the Rayon is much more even and smoother. Also, definitely more juice is held by the fibers. With regular cotton, juice is "soaked" into the cotton. But Rayon fiber seem to literally "hold" the juice. Much more juice is visible between fiber strand in Rayon where as the regular cotton seem to "suck in" the juice into itself.
- Fiber strands run pretty strand. One of side effect of straight fibers is, you can fill the coil with this pretty snug and it wouldn't choke the coil.
- Pretty cheap
- Don't have to boil/dry them
- I would have to use them for longer term to be certain, but it does seem to have a cleaner taste.
Cons
- Just like the regular cotton, you have to tear up what you need. This process creates lots of loose fiber strands. KGD is much more convenient since they come in square shape. This isn't a big deal for me since I am used to working with regular cotton.
Side note
- For the first time in my life, I had a chance to go to a beauty supply store. (and yes, I stuck out like a sore thumb)

- They didn't have any small packs, so I end up buying 500ft box for $12. A foot of cotton would last me a few months....
Bottomline. I have made a complete switch to Rayon and will be reporting back with further findings.