I just purchased the Xbox 360 slim and here is my unboxing video. Its sleek, finger print prone and has a cute little beep when the power button is pressed.
Sitting in the dashboard, the Xbox is dead silent. While my content was transferring from my HDD to the new one, I did here a high pitched noise. Where it originated from specifically I'm not sure. It could have just been something settling in. I'm no tech expert.
The disc drive could not be heard from across the room while it was spinning, but up close it could be. Still a major improvement from the original 360. What was once a jet engine, is not a light whisper. The last thing I'll say is that this thing still gets a bit warm. As does the PS3, but with the history the Xbox 360 has, heat tends to scare me a bit. Lets hope Microsoft has redeemed themselves with the Xbox 360 S.