This update has a lot of bug fixes. Some are in Wifi and some in Bluetooth. There is 39 security fixes too. You can find a full list here. I suggest a good image backup before you update - I use SuperDuper for this.
Update:
- 12/14/15 - added link to SuperDuper. Very nice tool!
- 12/9/15 - one MacBook Pro (Retina) updated without issue.
I will let you know how my updates go.
Michael
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