Just a note to my clients–please resist the urge to update to OSX 10.11 (El Capitan) for a few months. As with all major OSX updates, it introduces cool new features and uncool new bugs. I’ve tested it on a couple machines and found it fast, even on older hardware–however MS Office 2016 users are reporting crashes and there’s plenty of other reasons not to be bleeding edge, especially on a production machine.
So wait until 10.11.2 or .3, unless you’re feeling lucky.