I have a 15" Macbook Pro that is about a month old. I was having some problems with my PC desktop, or it was just acting like a PC desktop , and I got the bright idea to go and buy a 27" iMac. Well, now I haven't used the MBP in a few days. I am really happy with both systems. I was getting the spinning ball quite a bit, but I put 8GB of RAM, 12GB total, in the system and that doesn't happen anymore. This is one of the best problems I have right now and I am blessed to have it. I just thought I would post something positive but probably useless.