There is nothing in the update that mean much to me. I upgraded due to OC disorder.
By the way, I have upgraded immediately every single time the OS or any of my business software (FCP, After Effects) changed.
I have read the endless descriptions of elaborate procedures for upgrading, involving multiple boot drives, etc. and multiple backups.
I always thought those were a waste of time. I have never had a single problem and estimate I have saved many many hours at the risk (which I was aware of) of rebuilding my system.
Best,
Lance