Yeah, I just saw the second review, and I was surprised that this guy didn't take the time to read the manual or the details on Fiio's website about the use of DMODE switch and "USB rec" connector.
But also, he states that the sound quality is AMAZING, but it seems he only listened via BT with his QC35 headphones if I understand well his review
What ???
Fistly, he does not know that the digital path up to the BT module doesn't affect much the sound (maybe a bad BT codec implementation can degrade the SQ of course)
Second, he uses Bose QC35, that was praised as really good NC headphones at the time, but I had the QC25, and whereas the NC part was performing well, I wouldn't talk about Hi-Fi speaking of theses headphones... While used with or whithout NC, the frequency response is different but terrible in both modes. Despite being very very light and comfortable, I finally sold it...
So thank you for the "no nonsense" info on this unit
What is strange is that you didn't experience any of the glitches some others did, like the weird behaviour of << and >> buttons or play/pause, the skips in the middle of a track... Just the gapless that is not consistent.