I was on the fence for the longest time about upgrading from 4 gigs of ram in my macbook pro (see sig) to 8 gigs of ram. I dont consider myself much of a power user anymore but I do usually use these programs at the same time for most of the day: Maya Unity 3D XCode VMWare (running linux vm) Corel Painter X Photoshop ZBrush Logic Express iTunes Safari Adium It was pretty good at running all of these but I would semi-frequently get the beachball especially if I tried opening them all at once. Well, I decided to get 8 gigs of RAM from OWC for $467 and it was the BEST decision I made in a long time! Everything is so much faster, "snappier" if you will. Programs open so smoothly and system performance picked up. My computer feels like a brand new machine. I would say if your on the fence about buying, just try it. You'll love the results!