To me the 29 is just perfect for the resistance and wrap count I prefer.
And yes I find that it heats up and coils down quicker than 28.
It s easier to work with than 30 and doesn't cause the terminal screws to come loose like 28 and lower.
I originally picked it up for my chalice cause I was having a difficult time getting the screws to work with 28 and I wound up just really liking it in all my RBAs
I tried Nextel and actually really liked it for a couple of days (such that I bought a few feet of it) but it just felt, can I say, "wrong" vaping stuff that requires special treatment to remove processing chemicals from it? I wasn't feeling too comfortable with that. I also noticed like a very fine dust on my fingertips when I worked with it.
Especially since wicking with cotton was easier for my build style (build then insert wick).
Also, In my case it also produced what I would describe as a "wetter" vape. Just not the same as cotton.