Sony never got too much play on this site since Sony locked all of their MP3 players into their proprietary media player SonicStage. I love their designs, sound quality, and battery life but SonicStage was so unbelievably terrible it kept me from picking up any of their players. Sony finally wised up and joined the rest of the portable music world making their devices MTP, thus being compatible with most media players and music services.
Sony will soon release the A820, an upgraded version with Bluetooth, larger screen, and larger capacities. However, the A810 should not be pushed aside; it is still a very viable MP3 player that will still keep up with anything in its class. It is a great choice for people not needing all the bells and whistles of its newer sibling.