Having owned the Oppo HA-2, FiiO E12 and E12A, I bought this device on Amazon and simply forgot it in the US. (I live in Nigeria).   When I finally got hold of it, I upgraded the firmware to support DSD256 (was limited to DSD128 in addition to the full range of PCM and DXD up to 384KHz/32-bit).   But, my oh my, what a wonderful device!   No complaints really. I have tried this unit with the Oppo PM-3s and Shure SE846s.   My range of music varies from Classical to Darshan Ambient, to Jean-Michel Jarre to Barry White.   I strongly recommend...