I'm not usually a fast upgrader, but I was sufficiently tempted by side-by-side fullscreen mode and the new functionality in Notes that I decided to try El Capitan out immediately. I made sure I had a good TimeMachine backup, tested my corporate VPN client in a Fusion VM (it worked perfectly), and upgraded my fully specced late '13 MBPr 15" from Yosemite.
Most things seem to work fine, but I got some issues; here they are in the order I discovered them:
1. Mail account preferences presented me with a disabled copy of my corporate Exchange server settings. I removed this copy, which turned out to also remove the active settings (not obviously - the original settings were seemingly still there, but had gone once I actually opened Mail). No real harm done, since everything is stored on the Exchange server anyway, but annoying to have to re-configure and re-sync everything.
2. VMWare Fusion can no longer start a VM based on my BootCamp Windows partition. "Cannot open the disk '[...]/Boot Camp.vmdk' or one of the snapshot disks it depends on. Module Disk power on failed. Failed to start the virtual machine."
3. Initially, booting the BootCamp Windows install was impossible ("no bootable device found"-type error). After creating a BootCamp/Windows 8.1 install-stick and booting from it a couple of times but not proceeding with the installation (I was looking for a repair option), Windows suddenly began working again for some reason. Still the same problem with Fusion as in point 2, though.
4. Hand-off/Continuity has stopped working. Following the tips here (https://support.apple.com/en-us/HT204678) did not help.
5. Weird bug where Safari began throwing up new tabs like it was possessed. Closing down the program took away the issue. Next time I started it, opening links in new tabs from a pinned site resulted in tabs first not showing at all, and then turning up suddenly with no labels. Safari did work, but the address field did only work for opening URLs, not for searching. Closing the program using cmd+Q did not work. The Quit option in the menu was greyed out. Force-quitting Safari seems to have made this problem go away.
6. Not really Apple's fault, but a disappointment for an early adopter: RoyalTSX doesn't seem to be able to open a remote session to a Windows machine in split fullscreen mode (larger height than width). Hopefully this will be solved at a later time; I'd love to be able to read off something in parallel with working at a Windows box on my Thunderbolt Display while running the MBP in clamshell mode; to me that's pretty much the main selling point of split view.
Most things seem to work fine, but I got some issues; here they are in the order I discovered them:
1. Mail account preferences presented me with a disabled copy of my corporate Exchange server settings. I removed this copy, which turned out to also remove the active settings (not obviously - the original settings were seemingly still there, but had gone once I actually opened Mail). No real harm done, since everything is stored on the Exchange server anyway, but annoying to have to re-configure and re-sync everything.
2. VMWare Fusion can no longer start a VM based on my BootCamp Windows partition. "Cannot open the disk '[...]/Boot Camp.vmdk' or one of the snapshot disks it depends on. Module Disk power on failed. Failed to start the virtual machine."
3. Initially, booting the BootCamp Windows install was impossible ("no bootable device found"-type error). After creating a BootCamp/Windows 8.1 install-stick and booting from it a couple of times but not proceeding with the installation (I was looking for a repair option), Windows suddenly began working again for some reason. Still the same problem with Fusion as in point 2, though.
4. Hand-off/Continuity has stopped working. Following the tips here (https://support.apple.com/en-us/HT204678) did not help.
5. Weird bug where Safari began throwing up new tabs like it was possessed. Closing down the program took away the issue. Next time I started it, opening links in new tabs from a pinned site resulted in tabs first not showing at all, and then turning up suddenly with no labels. Safari did work, but the address field did only work for opening URLs, not for searching. Closing the program using cmd+Q did not work. The Quit option in the menu was greyed out. Force-quitting Safari seems to have made this problem go away.
6. Not really Apple's fault, but a disappointment for an early adopter: RoyalTSX doesn't seem to be able to open a remote session to a Windows machine in split fullscreen mode (larger height than width). Hopefully this will be solved at a later time; I'd love to be able to read off something in parallel with working at a Windows box on my Thunderbolt Display while running the MBP in clamshell mode; to me that's pretty much the main selling point of split view.