The phone's weight, in my opinion, is nothing to worry about given the phone's shape, the curve on the back, the soft glass, and overall, the way it fits in your hand.
You really feel like you have a nice piece of hardware in your hand. So the extra 20g over the 900 is nothing to worry about.
All these people dissing the phone for the weight are not being real at all. The phone sits perfectly in the hand and the 4.5 inch screen is very manageable with one hand compared to the S3, which I tried, and which requires enormous hand.
Correct.
Haven't added music yet to the phone. Will let you know some time this weekend.
Works amazingly well. All AUTO settings are way better than the 900. If you want to squeeze better details, then you can manually adjust the settings, but pocket-to-picture speed and quality are phenomenal as you can see in most pictures on my Skydrive.