I just got home and got my macbook pro classic refurb I got last week upgraded to 4GB from 2GB. What a difference!!! I run VMWare with xp usually have a ton of apps open when I work. Before with XP and other stuff it was right on the memory border. Now XP is flying, I didn't think it could run this well. Its just so freaking sweet being able to switch so fast between the 2. I have a vista PC and the only performance difference now is the video card and the storage. Its as fast as desktop, totally love the macbook pro. 