A few days ago, I decided to upgrade to the new OS X Mavericks, a free upgrade, which at the moment seems to work very well. The layout is closer to that of the new iOS 7 for iPad/iPhone etc., which I like a lot. In the process I have also upgraded to the new versions of Pages and Keynote, both of which seem faster and more streamlined. The fact that the Keynote file size dropped from 16,2 MB to 1,2 MB without any visible loss in information is amazing. Not a bad upgrade, so far.