The general update from the app store went fine here, first restart had KP but that was the usual AppleTyMCDriver.kext so booted off other drive and removed that, once onto desktop installed new Nvidia drivers and good to go. Everything stuck, sound, trim, sleep all good. Whats not so good is for some reason mail doubled all my accounts, none would open stored messages (just title, email addresses but message area stayed blank) so had to manually import all my mailboxes, delete duplicate accounts, etc. Bit of a pain. Then discovered Photos never imported anything from iPhoto so had to manually export and import off my backup...other than that seems ok. And the mail issue seems to affect real macs too...kinda odd but hey its an update never know whats gonna happen...