I bought a Sony HD1 just before Christmas and have used it extensively during a recent one month trip to New Zealand. I am new to hard disc players and spent time transferring my CD collection via SonicStage to the attracplus format. Now that Sony are making available the upgrade option to allow the HD1 to play MP3's, I am not sure what to do. Any advice please... basically, is it worth paying the £15 (not a lot admittedly) for the upgrade - are there advantages of MP3 format over the attrac format - I don't have an MP3 collection but am not sure whether this is a 'better' format to use. My inclination is to avoid the upgrade, particularly as all data on the disc will be lost and will have to be transferred again. However, the upgrade only seems to be available from mid-Jan 05 until July 05 so wouldn't want to miss the boat if it is worth it. Sorry for rambling on, any pointers would be really appreciated. Finally, some thoughts on my use of the HD1. The battery life is excellent - hardly needed charging at all. The sound quality is excellent (at 64kbs attacplus) using Sony £20 headphones. Very portable given its size and the volume is fine - especially with tweak of the sound settings using the 'custom' option - seemed to increase volume maximum sufficiently. Don't regret purchasing the HD1 at all.