Well I run Mavericks 10.9.5 by choice on my main workstations. All my hacks (15) have multiple boot partitions and each has El Capitan installed. I also own a 13 inch MBA from 2011 and a 15 inch rMBP from 2012 both updated to El Capitan.I find that Mavericks retains much of the charm of Snow Leopard. Detail in the icons and such that has been written out of the newer versions.This is my MakerBeam Skylake build. And many of my hacks are listed here: http://www.tonymacx86.com/completed-mods/87399-neilharts-completed-case-mods.html Good modding,neil