Sorry not a good discovery if you ask me. The first time when I open up the app I get a full size advertisement. I didn't spot an option to remove that via an in-app purchase so no go for me. Besides that the App Store description is in Spanish or somesort in e.g. NL,DE App Stores while in others it is in English (e.g BE).
There are better alternatives out there like a few I suggested in this topic. I really like MusicSense(Pandora like radio, not available in the US but in Europe only so it seems), Gramma Music(Pandora like radio), The Artist Union and Soundflake as great free services without any annoying ads and MusicSense and The Artist Union can even play offline. Another one of which I read great things about is Trebel Music (does have ads though) but also have offline option but is US only.