For n=1: The 10.9 GM has been smooth as butter, didn't break any of my mac apps or *nix tools. Obviously double-check on any tools which are mission-critical, b

For n=1: The 10.9 GM has been smooth as butter, didn't break any of my mac apps or *nix tools. Obviously double-check on any tools which are mission-critical, but I recommend it in general, a noticeably pleasant upgrade to usability, battery and performance.