Hey, I'm planning to update my OS on my late 2011 MBP. I currently have Mac OS X Version 10.7.4 I will be buying/downloading ML today and have some questions. Is ML anyway buggy or is it stable. Is it easy upgrade from 1 to the other How is it done, I've never update OS on a mac before. I have my HD partitioned so can i install new ML over existing Lion in that partition fresh or does it leave files/software. Any other info anyone thinks I should know Thanks in advance.