Summary: I ended up selling this player shortly after I bought it because I was not at all impressed by the sound quality, which is a bit surprising for Sony. Then again, I'm comparing it to an iRiver H300 which is superior IMO. I really liked how small and compact it was; the menus were relatively easy to use; I didn't like that it had a proprietary USB connection; the battery life was great.
Summary: This Sony player is not a bad little mp3 player for music, though dont't expect good results for audiobooks/podcasts. It doesn't resume playback where you left off, so getting to the point you want in a long track is very frustrating. Good sound quality, great size, nice looking player and nice screen. Don't confuse this one (model is Sony 438) with the 6-series which has better podcast support.
Summary: It's nice, but... I use it mainly for mp3s of radio shows, and talks, and mp4s (like univerity lectures) from iTunes. For mp3s it seems fine. But, I've found way too many videos on iTunes (even mp4's) that it just won't play. If it played most of the iTunes mp4 videos I've tried, I'd rate it a 5. Maybe a net book with Quicktime installed is the way to go for video lectures.
Summary: I will preface by saying that as a Sony, of course it sounds good. In my experience so far over the years, my Sony cassette Walkman, CD player, CD/mp3 player, and now finally mp3 player have outperformed all other brands in terms of pure sound. Plus Sony has one quirk of programming I've found on no other brand of mp3 player (and I looked!) - you can organize and play your files by folder as well as the more common album, artist, genre, etc.
Summary: Ya he escrito sobre el "truco" del programita necesario para poder introducir vídeos en el Walkman. Hay más. Resulta que para recargarlo, solo nos dan el cable con toma USB. Probé con esos enchufes a la red adaptadores USB que cuestan unos 3 euros y que me valen para otros aparatos, desde el GPS hasta otros reproductores de mp3; es inútil, con Sony no funcionan.