This update has been surprisingly painful for me. I'm on the GA-Z77X-UD5H and I've had frequent kernel panics since the update. They seem to come after the system's been up for a little bit of time and maybe had some time to idle, but it's crashed in the middle of use as well. Here's the kernel panic log dug out of
All the kernel panics are crashing in PerfPowerService. I have Clover 5128 installed and the system had otherwise been perfectly stable for the past few weeks with no other kext/bootloader changes.