Here is my take on the D50 at this point. It temporary replaced a Wyrd4Sound DAC 2 DSD SE. Connection to the dedicated computer is via Shunyata usb cable. Power was supplied by the provided USB cable. Sound was tipped up in frequency emphasis. It has a irritating emphasis in the upper vocal range. After a number of hours of play, I replaced the power supply with a regulated 5 volt DC, 5amp unit. That made very noticeable change for the better in the bass and dynamics overall. I planned on modifying it just for fun, but didn't realized how small it was. Op amps and other chips are all very small surface mounted components. All I have done inside is add ERS fabric on top of all the chips. That seemed to clear up the overall resolution a small amount. At this point, I would call it a very good traveling dac for the businessman on the road. Needless to say it didn't match the Wyrd dac. There is still the problem with the emphasis in the midrange IMO. It might be a more pleasing dac in a lesser resolving setup. YMMV
"Sound was tipped up in frequency emphasis. It has a irritating emphasis in the upper vocal range."
The Audio Technica ADX5000 headphones that I have is lacking just a bit in precisely this area. I feel that these headphones are noticeably veiled in the low treble region. So, if this dac does indeed sound to me the way it sounds to you in this frequency range, then I would consider the D50's presentation as an answer to get the sound presentation of the ADX5000 more to my liking.
So, what may be interpreted as a negative for you may be interpreted as a positive to someone else (depending on their preferred sound signature in gear, and the sound signature of their other components in their audio chain).
Appreciate everyone here for sharing their impressions on the D50.