I am going to be buying the higher end MacBook Pro soon and most likely it will have Lion installed on it. I will use it for a day or two to see how it is running then I will upgrade to Mountain Lion. I am going to apply for the free upgrade as soon as I can so hopefully I will only have to wait three days max for my code to come in. For those of you who bought the higher end 13" MacBook Pro after its June 2012 release, when you upgraded from Lion to Mountain Lion did you have any problems? How is everything running now?