I bought one from a third party retailer because of their excellent hardware replacement warranty ($299 for 5 years, no questions asked, if they can't fix it they will replace it with the equivalent model, even if it is a G6 or 7 in 5 years).
I bought 2Gig of Ram cause I heard that the memory works in tandem so I thought why bother with 1G when eventually I will make the move to 2 anyway. I picked up an Airport Card as well.
The installation of the new parts was simple, and the information that comes with the computer provides all the pictures and info you could need.
I already had a wireless keyboard/mouse set from Logitech and they work flawlessly on the new iMac.
The salesman thought that the computer came with a 6 pin to 6 pin Firewire cable, it didn't though. So I had to make one additional trip to the store.
On my previous iMac I had used FileVault for a while, even though I had stopped using it a long time ago, it still affected the transfer of information from the old one to the new one. So, I had to transfer the files in reverse order, manually. Which was not as easy as letting the setup program do it. But that was fairly minor.
If you do a Firewire transfer, there will be a lot of fan noise. The fans in my 20" went to full speed for the entire time I was doing any sort of Firewire linking. This worried me a little as I had heard about problems that others had with fan noise. But it was just during that time.
The screen is perfect, it is so much brighter than the CRT in my iMac G3. I am still getting used to all of the extra desktop space.
With 2Gig of ram the computer flies, I don't have to wait for anything. The fan noise is barely noticeable in the background and the more I use the computer the less I hear it. Either I am not as focused on it as I was when I was worried about getting a noisy one, or most of the hard work has been done and it is just routine use now.
Overall, I could not be happier. This particular design is getting a lot of attention from friends I have who had no previous interest in Apple computers before as well. My G3 iMac got attention for the unique bubble shape and use of color, but people are amazed when I tell them that they are not just looking at the screen but the entire computer. Before the design was described as being "different", now it's "cool."
