Hey everyone, so I just purchased a used macbook pro from a friend for my first mac. I am interested in upgrading to mountain lion. He recommended that you should only upgrade the software once to maintain peak performance and that it was upgraded from Leopard. It is a MacBook Pro 5.5 It was purchased in early 2010 so it is a mid 2009 Macbook Pro. It is currently running Snow Leopard I believe. Its system version is Mac OS X 10.6.8. It has 2 gb of ram and its processors are a dual core 2.26 ghz. I have 124.71 GB of hard drive space available. Ive looked up the requirements and they meet them but I know the recommended guidelines are not always accurate. I think I listed all the necessary info, if I forgot something please let me know and I will do my best to find it. Thanks for the help!