Using the developer preview for about a week. I have a 2012 Air 13". DP3 was mostly ok, but would freeze and immediately reboot once or twice times a day. The newly-released DP4 seems stable enough though.
There's also something weird about Safari on Yosemite. Sometimes the tab bar would just hide completely and to get it back you'd have to reopen Safari. (The tab switcher and cmd-{ cmd-} would still work.)
There's also something weird about Safari on Yosemite. Sometimes the tab bar would just hide completely and to get it back you'd have to reopen Safari. (The tab switcher and cmd-{ cmd-} would still work.)