I love it. A bit on the high end of "affordable" gear at $2,750 list price but I have seen used ones for $2,000 claiming excellent or mint condition. Having heard a number of DAC's since buying it, I consider $2K a steal for a good used one. This is not to say it isn't worth every dollar of it's list price.
It hits all the checkboxes for me: solid state electronics, single-ended AND balanced outputs, impeccable resolution, effortless dynamic range, quite neutral with a hint of warmth in the mids (not sacrificing speed or transparency - vocals are divine, especially with the HD800)). What makes it stand out is the sense of musicality - I think the technical term people use is PRAT - pace, rhythm, attack, and timing. I feel I am listening through the DAC and not to the DAC.
Note: as you probably know, only input is USB.
I have no negatives to speak of. If I were in the market again, I might look at the April Eximus (includes head amp) or the Antelope Audio line.
Hope this helps.