The sound quality is undeniable, but the app has some issues. I downloaded many albums to my phone to play them on master quality, but older downloaded albums don't show the album information, and I can not play them if I am not online. The app doesn't play any Master song on Android. It doesn't matter if I use WIFI or download it. It will not work! At this point, I am paying for a service that I can not use. It used to work fine (I have an LG v40, which supports MQA), but it has been a year since I have not been able to play any Master song.