It'd be nice if you could save details like crossfade, shuffle and repeat per playlist. Some of my playlists are just lists of songs I like by genre, some of my playlists are sorted song per song. I've seen this in other music services, and it'd just be a lot easier. Especially for the Android app, where messing with such features is a bit.... clunky.
Otherwise, I couldn't be more pleased with the service. I can buy 2 cd's a month, or I can subscribe to spotify...
I see a lot of hate for them on this forum, but this is by far the best music service I've had.
Keep up the good work, enjoy my $120 bucks a year. =D