Got mine in 3 days (from Shanghai to Tokyo).
i7 4gb wireless keyboard.
Sticked in another 4gb I bought at a local store in Akihabara even before turning it on for the first time.
Result: AWESOME... no strange sounds. Can hear the hard drive, same as the previous core duo early 2006 iMac I used before. No flickering screen, no dead pixels, no sounds when it's sleeping, well... just perfect. And man this thing is blazingly fast. VMware flies, even with 3D games. It's hard to make it sweat, but I could do it compressing several videos at once with Quicktime and the CPU fan got over 2000 rpm, quite noisy but nothing alarming at all, not even bothering. If you put your hand on the top back you can feel the warm air going out.
In general use, the fan never runs over 1000 rpm.
Edit: Youtube wasn't a problem at all, CPU stays calm even using HD fullscreen...