(You'll probably need to click on the comment icon in the lower left-hand corner to view the Facebook comments.)
Some people couldn't resist taking a shot at Mac users.
Others report that Yosemite breaks some virtual private networks.
Some folks wish the new Spotlight window, which appears smack in the middle of the screen. rather than in the upper right-hand corner, could be manipulated more.
I admit that I, too, sympathize with the hankering for a retina-enabled display, now.
Meanwhile, some privacy experts are already pointing out that Apple collects your Spotlight searches in a potentially unsettling way.