I really like the Andriod interface although I wonder how it will handle it when the account is full.
The web browser one is occasionally unresponsive, lacks sorting to the degree I would like (Name/Artist/Album/Play Count/Count is pretty basic), and playlist and random play is pretty rudimentary. Granted I have more than 20,000 songs that I am trying to sort.
I like Amazon's cloud players UI better but with the amount of music I have it would cost to much money. ($$$$)
