😀 Absolutely love my 17" 2.0. This is my first mac in over a decade, and I'm so glad I've switched back! The first one they sent had a bum hard drive, but I called Support and they overnighted me a new machine. As I said elsewhere, great folks over there (one guy not so much, but the other four were wonderful!)
I've used the original iMacs, complete with the hockey puck and OS 9 at an old job, and there is absolutely no comparison. This machine is a thing of beauty - a screaming fast, powerhouse of beauty. Definitely not my last Mac - there will be more. My mom asked me what I liked about it. I said, "Well, for starters, it works." (Which is more than I can say for XP)
I guess I'm sorta biased on the fan volume issue. I can barely hear myself think over the fans that are blasting on the overclocked PC (game machine), so the iMac appears blissfully silent. At night, we shut the PC down so we can sleep and the iMac just sits here silently sleeping and blinking. I'm still not sure how well the "Ambient Light Sensor" works. I've been meaning to wake up in the middle of the night to see if it really changes anything if it's pitch black, but I haven't gotten around to it yet. And there have been times when something has kicked on (I believe during the two times I shut it down or was updating or something) when it sounded like a Harrier jet taking off, but that didn't last long and stopped once it booted into the OS. 🙂