I know it's only $20, but I wonder whether or not it's worth it for me to get Mountain Lion. Right now, I have a 2008 Macbook with Snow Leopard. I'm skeptical about the switch because (a) I have a lot of old AppleWorks documents that I occasionally need access to, and (b) I won't be able to take advantage of many new features (e.g., swipe gestures) because my computer is so old. What do you think? Is it still worth it?