Ive been using this for over a year and theres always major buffing, where the music wont load up and at times the music wont play. At one time I had to delete the whole app and download it again and lost all my playlists. It should save your playlist and have a user login, so it does save it. But all and all when it works...its good.
HotTopic4Life about FreeTube - Free Music Player for YouTube