I had this watch when I worked for Sony Ericsson. I actually had all 3 (music edition with rubber strap, executive edition with SS band and this classic edition with leather).
My favourite is this classic edition.
They are great watches but I had to give them all back when I left
The display shows name or number of person calling, track name, message indicator. You can start, stop, skip tracks fwd/backward and adjust the music volume on your phone. The watch also vibrates when you are getting an incoming call or message.
The only downsides are the watch it a little bit heavy and you have to charge it every couple of days or so.