I have just rooted and installed Wanam, let me restore my Titanium backup and have a cruise around but the physical differences I've noticed:
- N2 feels more robust in the hand, the S3 felt nice and comfy though, more comfy than the N2.
- The screen is glorious, text is nicer to read.
- The N2 speaker is more detailed than the S3 speaker.
- Home button is the same colour as the phone
- Back cover gets less (if any) finger prints unlike the S3!
- The volume buttons have better tactile feedback.
It's surprisingly easy to use one handed too.
The extra weight feels minimal, still light and thin