Harmattan's gui suffices, imo. What really sucks is that 24bps FLACs, of which I have some, are played in mono. Worse: the player is an energy hog. QuasarMX solves both problems. It amazes me how much difference it makes in energy consumption using a BT headset.

(Yeah I know, 24bpc flac over a lossy SBC-compressed bluetooth conneciton doesn't make sense. Well, transcoding while I've plenty space left makes less sense. I guess Jolla should support apt-x )