I own a late-2010 MacBook Air (1.4 GHz Core 2 Duo, 2GB RAM), and I'm wondering if should update my OS from Snow Leopard to Mountain Lion. CON: The obvious argument against updating is that I have only 2GB RAM, and this worries me. I don't find this to be very problematic in Snow Leopard, but I've heard that Mountain Lion is a lot more resource-hungry than Snow Leopard. PRO: Why do I want to update? Only one reason: iCloud. I've recently expanded my Apple Ecosystem to include an iPhone and an iPad, so it would be really convenient if my mac could also sync to the cloud. Other info: I plan to keep my MacBook Air until 2014 (at which point I will upgrade to a new MBA with 8GB / 16GB RAM).