So I spent a year or so using the S2, then a year or so using the XMP3, now I'm playing with the S2 (as an mp3 player) again.
I have to admit, I really prefer the S2 mechanically. It's a little bigger, but the "feel" of it over all is way more smooth and solid. I think I got better battery life and didn't get all the "updating" hangups with the XMP3, but structurally the S2 seems far superior - especially with regards to the wheel. I've had several issues with the wheel on the XMP3, but my 2 year old S2 still feels like new.
I have to admit, I really prefer the S2 mechanically. It's a little bigger, but the "feel" of it over all is way more smooth and solid. I think I got better battery life and didn't get all the "updating" hangups with the XMP3, but structurally the S2 seems far superior - especially with regards to the wheel. I've had several issues with the wheel on the XMP3, but my 2 year old S2 still feels like new.