Took an hour+ to install El Capitan; progress bar stuck at 30 long, long while and again at 12 minutes for a while. Automatic reboot. Fatter, shorter, quicker progress bar. Reboot with long, loud tone. Ah...startup progress bar...slowly but surely...then stuck forever at about 85%. Finally, reboot? No, just black. Forever, black. Tap the on/off to wake. A little lighter shade of black with an mouse pointer. Tap again, black. Tap again, the lighter black with pointer. A few minutes longer...screw it and hard shutdown. Restart. Starts at the 85% mark again. Wait. Hard shutdown. Restart. 85% mark. Hard shutdown. Restart with PRAM reset. Ah, empty progress bar. Waiting...waiting...progress bar never shows a pixel of black. Hard shutdown. Restart with PRAM reset. Same result. No luck with safe mode. Restart in recovery mode. Disk Utility is WORTHLESS. All it does is look at the files. No permissions utility. Finally, overnight Time Machine restore and prayers for two Parallels VMs. Will they recover? Came back this morning and got a scare when the first thing after login was iCloud setup, followed by a title bar called Setup Assistant. Oh-oh. FINALLY, everything started loading to the state it was in at the last TM backup yesterday at 2:36 p.m. El Capitan should be shot for treason. I'm sticking with Yosemite.