I just bought one yesterday, and its brilliant.
Tiny, lightweight, good sound, easy to fill with music from itunes.
It does everything i wanted it to do, for walking/skating to work, on the train, etc. For short trips i never looked at the screen on my full size ipod anyways, so this is even better because of the size.
I still plan to use my old 20GB (which i plan to replace with the next gen ipod photo, hopefully 80+ GB) ipod (plus amp and ety er-4p cans) for any longer trips, but this is perfect for everything else.
I looked at other small flash mp3 players, but i liked the shuffle best. It may have no screen, but because of this the navigation buttons are much more useful than the tiny ones on the others.