been running the betas for a while, now with the release on both computers.
I think 10.11 is a pretty solid release, pretty well tested. No problems with me using LR/PS, C1 seems OK as well although Phase seems to have a "don't touch for a while" policy Printing to Epson printers no issues at all either.
There was a glitch with my Logitech mouse, but software already available to fix it. Also Carbon Copy Cloner supposedly had an issue, but again update is already available.
El Capitan also "fixed" some odd graphic issues I have with my 2013 Mac Pro, that I have been struggling with since Yosemite (choppy video with iTunes and in Safari, also with typing input into forum replies such as this one). Never affected performance of things like LR/PS or even FCP, so it was really just an annoyance. Showed up with 10.10.1, Apple never could resolve it, despite a few tries. Pretty random problem, not really common place. Fortunately all gone with El Capitan.