UAPP is what I have been using since yesterday. No stuttering or playback glitches till now where as with the Onkyo app the stuttering was quite persistent and annoying. I am guessing it has something to do with the USB driver used. User interface took a while to get used to , but so far quite liking it apart from one small problem - when I randomly choose a track to play the first 0.5s or maybe even the first 1s will be skipped. This is a minor concern, really, and mostly unnoticeable in day to day use.