Everything just works
After installing the recent OS X on the 2011 Macbook Air, I can honestly say it definitely got faster, but most of the new features are rather invisible. Contacts app and the new calendar still look pretty ugly, but the new notification center is a much better piece of design and to some – more widely used. Right now all apps seam to be working right, with no errors or freezes. We’ll see how it turns out in the long(er) run.
UPDATE: Twitter integration (the system-wide one) is hidden in Mail,Contacts & Calendars. Not that easy to find. Also to get to the notification center you need to make a two finger swipe from right to left, but start outside of the trackpad. That’s the only way it’ll work. Took me a while to get to that too.