Surprise! Its great.
I wasnt expecting this app/service to be so good. Its simple, and gets it right. Like being able to seamlessly access your locally stored iTunes music and playlists. Things like that just show the correct attention to detail and user experience.
-Edit-
A couple days after writing the 5 star review above the app was updated. The unnecessary "offline mode" toggle was added to the side menu (the same functionality was present previously, and better implemented). Now there is a additional step to take every time I want to access my locally stored music. Pointless steps backward like this are the exact kind of bad UI that I was talking about when I praised Amazon above. Now I am worried about future updates; they may continue to make the app worse instead of improving it.
A typing monkey about
Amazon Music: Songs & Podcasts