Now that I have done the upgrade, from El Capitan, I sort of wish I had not done it. Lots of problems with what should have been a straightforward, gee whiz update on my 2015 MBP. First thing that happened was it lost my keychain in the upgrade so nothing worked for my internet accounts. The part about pop up videos not running unless you want them too on webpages - wrong, they run just fine. Boot ip time is significantly longer than El Capitan and same with shutting down. There are still things I can t find but know they are there somewhere. It seems to me that Apple did not do a real good job on this upgrade and I'm hoping since I'm in it now, that future updates will solve problems. Seems that Apple is not doing as well as they used to on software.