I've had SE W800 for a few months. Good features I could mention are:- Pretty good sound quality (radio, mp3)- Battery lasts long, even when listening to the music thru the built in speaker- Expandable memory - up to 2 Gb Memory stick- Flight mode (you can listen the walkman on a plane without turning the phone transmitter on)- Decent radio receptionHowever, there's a bunch of things that do not make this phone what it's advertised as: a good mp3 walkman. Here's why:- No possibility to search tracks in the mp3 player. On a 2Gb Memory stick it becomes a problem- Under "Tracks" menu the walkman only displays ID3 tags of the mp3 files and even then it only shows the song title from the tag, not the name of the artist. Only if the tag is not written, the file name is shown. It would be much better to let the user choose between these two modes. Or in the worst case, if only tag info is shown, to show both artist and song name. When you try to sort files in the player, the tracks list actually does not change, so you have no way of knowing if the player sorts anything and how. In contrast, the "File manager" only shows the file names, but not tags. Weird!- When headphones are not connected and the play/pause button is used to stop playback, the player goes into pause and consumes the battery. No icon is depicted on the screen showing whether the playback is paused or stopped. This does not happen when headphones are connected: when paused the walkman goes off but remembers the position where playback stopped.- Joystick search inside long mp3 files is deadly slow- Deleting mp3 files thru the walkman does not delete them. You have to go thru the File manager- Shuffle mode in the walkman does not really play randomly, especially on a 2Gb memory stick- No support for playlists in pls or m3u formats. Instead some really inconvenient way of making playlists in the phone.- The player supports a wide range of bitrates from low (32kbps) to high (320kbps), but at low bitrates it sometimes wrongly estimates the length of the track. As a consequence, when you pause such tracks and then resume, the playback starts from a different place in the file. This really disappoints when listening to long files.- USB file transfer to and from the phone is very slow. I had to buy a separate card reader to copy files to the memory stick at a reasonable speed.- Content of the memory stick is not visible while the phone is connected to the computer- No standard headphone jack on the phone. It's only located on the headset.Other downsides:- No lock for the camera leans cover- Picture quality in low-lighting conditions is bad- No regular ringtone comes with the phone (instead there's a bunch of weird melodies). You have to download it separately from SE website (for money, of cause). I had to record one myself.- When the alarm goes off, it only rings for about 30 seconds and then automatically goes into the snooze mode for 9 minutes. Isn't the whole purpose of the alarm to ring until it wakes you up or until you switch it off yourself?- 850Mhz band missingIn conclusion, the phone is not too bad, but comes with a bunch of small annoying imperfections, which makes it too highly priced for what you get.