This thing is really pretty good. I am delighted and it was cheap. I happily will run with a smile on my face, just like if I stole it.  This thing is a great deal and pretty good sound ..with great potential. I am a very happy Fiio customer.   I have not found any files that it will not play. That is a great thing .. but (blushes) .. most of my music is MP3. So .. it actually does not sound bad at all. In fact my flac files .. I cannot really hear much difference. That shows you how good this thing really is. I think in time I will buy better...