Omaha,
I tried the PuffLon a couple of years ago.
It did'nt do any of those fantastic things for My gun,but it does as good a job as filler as does Dacron.
It is quite expensive,and I only use it for Hunting loads,or loads that may be subject to hard use. My reasoning is that Dacron,although I've loaded thousands of rounds with it without any problems,MIGHT some how shift it's position,and leave a space between it and the powder. This will destroy any accuracy,and may be dangerous.The PuffLon completely fills the case,and,if it is slightly compressed,can't cause this problem.
That's all that I know.
Good luck,
Frank