Update went smoothly. Only had one hiccup which was that the first download was corrupted so had to start over. Standard reinstall audio. Curious to see how OS 10.11 will work in terms of updating to it.
Update from 10.10.3 went well, but afterward tried to download the full OS Installer from the App Store, and it went on forever. Activity Monitor showed the iTunes store was active! I killed the iTunes Store process, but the gear kept rotating... and on... and on. Gave up. Does anyone know what's going on?