The scroll wheel is different, but after a week, you'll have forgotten the moving one.
My first (very early) unit had a problem with the remote, my replacement took forever to be delivered, but works perfectly.
The clock/alarms feature in the 1.2 firmware eats battery life.
20GB is enough for me (a music JUNKIE) with careful playlist selection, but I'd like enough space to carry my home directory as well.