At the risk of angering the OS gods I just wanted to note how great my experience with El Cap has been since updating to the GM candidate. It has been very stable and fast so far. I am really enjoying the improvements to Safari (speed, pinned tabs) and used split view for the first time today - it is a very helpful feature that is much more efficient and easier than switching between two apps to get the job done. The notes app and handoff/continuity are working perfectly with IOS9 on my iPhone. I also like the new SF system font and default color palette used by the OS. Overall - a great release by Apple. YMMV.