In response to the original poster's comments, I have been using El Capitan since the earliest betas. When one chooses to live on the technological edge, it is only natural that a few apps will break along the development road from early betas to final Golden Master. Thus, I was not surprised that both Bartender and cDock broke, and it seems that MAMP PRO may have been another casualty as well, as of DP8. However, both Bartender and cDock have since been fixed by their developers. MAMP PRO is a big question mark still.
Overall, I have noticed a marked improvement in stability between Yosemite and El Capitan. My experience has been that El Capitan has been quite solid, and I can appreciate the fact that Apple is taking the time to build up and reinforce what it gave us in Yosemite and earlier iterations of the OS.
If I were to complain about anything, it is about the rather drab GUI with its flat gray and light gray interface. It simply does not appeal to me. I am an old school Mac user since 1990, so I miss the bright colors, shiny bevels, depth, etc. But that's just me.