This is one of those devices that borders on the magical. I like the design of the intelligence behind the interface: while the the thumbwheel is simple and elegant, the details like it keeping track of what you listen to and allowing the user to rate tracks and preset the EQ for each track is very nice. The custom playlists are nice, allowing you to build a playlist by genre, time period or artist, as quickly as you can ask for it.
Maybe all this has been covered in reviews or I’m the last person to discover these cool things . . . I think it’s very interesting.
I have 204 tracks, 15.8 hours and 1.09 Gb used so far. I’m finding my biggest problem to be finding disk space for the music: I’m going to be limited by that until I can get some space freed up or buy some additional storage (80 Gb FireWire drives are available on eBay as well).