I'm thinking of upgrading my 2011 MacBook Pro to Mountain Lion. I was holding out on this as I had some old games I was playing that needed Rosetta, but I managed to solve that problem at the weekend with Virtualbox. I'm mainly thinking of upgrading for the iCloud features and Keynote (the latest version is not compatible with Snow Leopard.) Also I'm using Tumult Hype and some of those features are not compatible. So my question: How is that stability now? I know there were issues early on that got patched, is everything OK now? What should I watch out for if I upgrade? Any tips here, last time I upgraded was Panther -> Tiger and that was a fresh install. Can this even be done if I download from the App Store, or is it always installed over Snow Leopard? Thanks in advance.