Love mine! Only problem is, and this seems to affect many people's 24" iMacs, is that if you are in a truly quiet room (ie, you are trying to get work done) you can hear a hum that gets louder whenever the screen isn't at maximum brightness.
I'm told that it's just an inverter, and Apple will replace it for you, but I haven't had a time where i thought i could be without my computer long enough.
it's great otherwise!