First impressions: 24-inch iMac
First off, let me comment on the display. It's not perfect. I definitely have some darkness in the corners, but it really runs the entire length of the sides. It's somewhat disappointing, and is most noticeable on both sides of the menu bar.
Also, the lighting of the display in general is uneven. When looking at an all-white screen, the lighting seems to vary in fat horizontal bands across the width of the screen. But this isn't noticeable in normal use.
Finally, dead pixels: I have 4 (my iMac G5 had 1). Only 1 is normally noticable; the other 3 just show up as dim green spots when the screen is dark.
Having said all this, I think I'll keep the machine. I find I don't notice the pixels in normal use. If I used the machine to watch movies they'd probably be annoying, but I don't. We'll see.
Other than the display, the most surprising thing so far is that it doesn't feel any faster than my iMac G5. I had expected a huge difference. I'll see if performance improves when I upgrade it to 2 GB RAM from the standard 1 GB (I have 2 GB in the G5).
The speakers suck, but that's no surprise. I don't use them anyway.
The FireWire migration from the G5 was very smooth; not perfect but better than I expected.
15" PowerBook G4, 20" iMac G5, 24" iMac Mac OS X (10.4.7)