Been running with quadruple the stock Macbook ram for a couple of days and I have to say, it is sweet! The dashboard doesn’t have massive lag, and everything else doesn’t choke the second I start doing heavy work. Even though Razer’s Pro V1.6 mouse has the most terrible drivers I have ever seen, I still picked up Razer’s Pro Mobile Bluetooth mouse. I hope to get a review on that in soon.
Seriously though, get 4GB if your Mac supports it. But don’t buy it from Apple- do research on which RAM is compatible and it will save you hundreds.