Hi all, just got my batch 6 DX50, firmware 1.2.2. Smacked some flac files straight in to it, battery was fully charged on arrival. It works out of the box which no hitches, hangs or glitches (I know that's the worst this to say as it won't work next time) Anyway I am blown away by the detail and clarity of this player. I am using shure 425s and they are beginning to sound great. As I was hearing some much extra detail it takes a little while for your ears to adjust actually. I know this thread is mainly about DX50, iems and amps but when I pair the DX50 directly to my Mackie HR824 active monitors then the sound is truely special. Love the DX50...just music!