I'm personally satisfied with Mountain Lion. - My Mac feels smoother and nicer to use, the new dock is beautiful. - Safari 6 made me leave Google Chrome. - Notification Center is working great. - I now use Notes + Reminder, imo they were pretty much useless before (in my case at least) because you couldn't manage your events + notes on the Mac. - Dictation is a useful new feature, a bit annoying that it just support few languages (my native language isn't supported) - AirPlay kinda disappointed about this, since it doesn't support my MacBook Pro (Early 2010) Overall I think it's worth the update, even considering the low price. Your opinion?