I downloaded the app a few weeks ago and am currently really enjoying it, but there's two things stopping it from being perfect (for me), DLNA casting support and a favorite button on the notification widget (like the thumbs up on Pandora/Google Play Music except it adds it to my favorites playlist). If you could add those two things, the app would be my perfect music app. I've been thinking about buying it already but if you add those two things I definitely will! Great job on the app already though, definitely the best I've used. Also, sorry if those suggestions have been made before. I searched the thread but didn't see anything regarding those.
Edit: Sorry, I'm new to the forums and just saw that there was a feature request form at the top. If I had realized that before I wouldn't have posted this comment. The praise still stands though, the app is great!