Year's ago at my first printing workshop, I was told/taught that a disadvantage of plastic reels is that PhotoFlo can't be completely cleaned off them and the reels get gummy. Since then, I lucked into a Jobo CPA2 that included several Jobo plastic reels and a tank that were gummy. I've always assumed it was because someone dunked them in PhotoFlo.
That said, I find steel reels much easier to load than the Jobos but I'm not giving up the reproducibility of the Jobo system over a little extra time to load the reels.
Dennis