My Mid-2010 13" MBP still runs really well. It is a 2.4 GHz Intel Core 2 Duo with 4 GB, (320GB hard drive thats about 2/3 full). There are occasional odd things like any computer, but I am pretty content. With my specs and the comp being over two years old, I'm wondering how well it would handle the upgrade to Mountain Lion. I couldn't tell from the forums (as forums are going to be biased towards complaints and problems) how well my generation MBP does with OSX ML, so I was wondering if anyone out there has a better idea? thanks a lot!