Anyone care to contribute?
For me ...

The Good:
Gapless playback with ATRAC3Plus
Astounding battery life (removable, too!)
Bright, crisp sound quality, good all-round definition and ample bass
Tiny file sizes (ATRAC3Plus @ 64kbps), leading to more CDs on a 30GB drive
'New Tracks' function - very useful indeed after a small transfer of new music
Overall dimensions - surprisingly small and effortlessly portable
Looks - beats most DAPs for me

The Bad:
Limit of 60 characters per field (artist, album, etc) on player
Faulty Repeat OFF function (for me and some others, it's proving ...)
No renamable playlists-on-the-go
No track or album queueing facility
Very faint hiss when playing (but only at the lowest possible levels)
Easily scratched screen
And - for some at least - cracking buttons!
Who's next?