I've had one since they came out and it's an outstanding value! I have a 16-gig card in it and record myself in WAV format most nights. I plug it into the aux in in my car on the way home to critique new songs and tweeks. You can plug it into the PC for transfer, or just pop the card out and plug it in instead.
Very versatile and of top quality.
Of course you can load MP3s for playback during break or just to listen.
You can record via stereo line-in, as I do, or with external mics, or the built-in mics.
DonM