This unit is fantastic for the money and scales incredibly well with my AKG K812 headphones. Has replaced my Schiit Gungnir and Arcam R-Head setup that i had prior to owning this. Can't comment on DSD aspects of this little beauty, however running it through USB from my Linux PC with Spotify Premium is bliss.
My unit was manufactured in June 2018 and was acquired second hand about 2 weeks ago.
This is my first purchase of an Audio GD product and i have to say i am impressed with both the build quality and the sound quality
It has given a new lease of life to my headphones .... they love it.