I have to say that sometimes I like the “small” release without lots of issues. El Capitan is one of them. Only problem I’ve seen so far is that Private Internet Access needs an update.
But the new Side by side is pretty cool as are some of the gestures that are copied from IOS.
I used Tunnelblick for a while, but it kept hanging Yosemite and this seems to work better. The main thing is to switch to TCP connection for things like mail. I also usual up the security because what the heck why not on these fast machines.