Re: been saying it for decades... @Matthew 17
OSX (at least Yosemite and Mavericks) have now started to produce occasional but annoying app-store pop-ups asking you to upgrade to El Capitan.
Is that in general or because of some applications that have gone 10.11?
So, far the only thing that has failed me on OSX10.11 has been an nmap binary, and that was not El Capitan but two bugs in the binary distribution, one of which has already been fixed. I could have switched to the macports version but I've decided to hang on so I could help with debugging the problem.