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 any audition to try:
 
Allegretto Movt of Beethoven's 7th Berlin Philharmonic, conducted by Herbert von Karajan, DG (available as 192/24).
Watch Your Step - Darshan Ambient
Crystal Curfew - Tangerine Dream
After Midnight - Ray Parker Jr.
Arpegiator - Jean-Michel Jarre
I'm So Blue and you are Too - Barry White
Mellow Mood, pts 1 & 2 - Barry White
Tubular Bells: Introduction - Mike Oldfield (SACD rip or DVD-Audio)
Moments in Love - The Art of Noise
 
You can't go wrong. Just don't forget to buy a Camera Connection Kit for iOS or USB OTG for Android. And the Onkyo HiRes App.