Summary: The product address I've given is for the 575B The Sony site doesn't appear to have a link for the P version, but I'm guessing it's just the black case instead of the silver one. The P in the model name is for Progressive Scan. I don't have PS Television, so I can't comment on this aspect.
Pros: Plays nearly anything, according to the manual., Very thin design., Good menu design.
Cons: Doesn't support playback of MPEG video files., JPEG playback seems to assume 4:3 aspect, so if you have a slide show, it will be stretched. I haven't investigated this any further., It's a little slow from turn on to playback.