I was in the process of downloading the Yosemite installer to roll back to Yosemite and for some reason checked out this forum and saw the 10.11.1 update was rolling out. So instead of doing the clean install of Yosemite, I did the update followed by a clean install. So far, I'm not having Safari issues that have been plaguing me since the El Capitan upgrade. So that's good. (I never had Office 2016 troubles, but I'm not a power user of Office, just light Word/Excel/Powerpoint, but hadn't had any issues under El Capitan regardless.)
I'll be watching my Mac like a hawk today. First beach ball that shows up when browsing or loading an app and it's back to Yosemite I go for the next couple months.