First time Mac user. I picked up my iMac 24-inch, 2.8 2gb Ram, 750gb. First impression, it really catches the attention. A guy congratulate for my buying while walking home with the box. Leopard drop-in. I installed and it was ready after 30-40 minutes. It was smooth and easy. No problems. My first thoughts are that this is a very powerful machine: silent, fast. The display is great. I don't notice the gradient problem. It might be there, but I just don't see. It is true, though, that it looks a bit yellowish, but I don't think it's a big deal and it might be fixed with screen calibration. Big and only problem: freezing. I suffered 5 freezers in less than 24 hours (with 1.0 software and 1.3). First time, 5 minutes after starting Leopard. It froze while browsing photos in cover flow. Then it froze again after 18 hours. Again while using cover flow. The it froze when I was copying some files from my external hard drive. I rebooted and within one minute I did the same operation and it froze again. It has worked fine since then (other 18 hours). I think all my freezers had to do with my external hard drive. Every time it froze, I was reading from the hard drive. I really don't feel like taking the computer back to the store since it does not seem that there's a fix that works for sure. I'll test the computer more until I decide what to do. About OS X, I really like it. It's easy to use and everything seems to work without headaches. I easily connected to my Windows laptop and copied my files. I'm still used to Windows habits, but I'm finding my way quickly. Finder and Mail are the only app that look a bit weak to me (compared to Windows Explorer and Outlook), although I feel that I need more practice to enjoy all the potential of the OS. I'm surprised with Safari (very fast) and I love Front Row. Still need to use more iWork and other applications. To sum up, I'm very pleased with my iMac. I just hope the freezing issue will be fixed. Otherwise, it's great. I don't get all the whining. Glad I switched.