I have had an iMac 24" 2.8Ghz Extreme for a few weeks and I finally got tired of it locking up. So I brought it back this morning and exchanged it for a MBP SR 2.4Ghz notebook. I actually had a 2.16Ghz but got rid of it because I wanted the big screen on the iMac. Well I'd rather have more stability and I did miss the portability of the notebook. So here I type on my new machine.