Unfortunately, I have yet to upgrade my machines to OS X 10.8, partly because I'm lazy, but also because I have a machine that can't make the switch. My mid-2007 Mac Mini can't be upgraded officially because it relies on Intel's GMA 950 graphics chipset, which is underpowered to say the least. However, after finding this guide I might just throw caution to the wind and update all of my machines. (Only after backing up of course.)