This is a really good product. It's very small and light (especially compared with my 20GB Creative Zen MP3 player!) but quite robust with it. I don't think it could be easier to use either. Just plug it in to a USB slot and drag and drop.
The screen is handy for navigating through folders and changing menu options. I find it very useful indeed (as I'm always switching between folders) although if you only plan to have one huge folder with all your tunes on random play I'd suggest the Zen Stone instead.
The only thing that stops it getting 5 stars is the battery life, which has caught me out once or twice. However it probably is long enough, especially if you are able to recharge at home/work daily. Perhaps I need to be more organised!
It got stuck a few times at the beginning too (i.e. it wouldn't switch on) so I had to stick a pin in the reset hole to get it going once or twice. However that seems to have settled down now.
All in all well worth the money, although in the long run, you may need to consider buying some decent headphones to get the best sound out of it. Shure e3c's are quite nice... but that's for another review.