In general, Doge produces a range of great tube products. They are a bit unknown but their products have great quality and the values this DAC and other amplifiers are tremendous. I also highly recommend their Doge 8 preamp, which I have been using for the past 8 years with great satisfactions.
I use both Doges in my main living room:
Doge 7 DAC
Doge 8 Preamp
Manley Snapper Mono Amp
Magnepan 1.7i Speaker
Audio Envy cables
I just noticed that Doge 7 is being back ordered, maybe due to high demand now. I am happy to see they finally got some recognitions they deserve.