Hey designer I've been using a Dac-3 Signature for about 6 years not currently using it as it's in the shop awaiting a donor transformer after a bridge rectifier lost it's life. As the Dac was built in 1995 that's 26 years of trouble free service to that point.
The sound is rich, and organic and musical without sounding overly warmed up. It makes Redbook sound as good as it could possibly be and no brightness or digital nasties. AN Dacs are really meant to reproduce Redbook digital they're not about hi rez, my Dac maxes out at 16/48 but that's just fine for me there's an entire universe of music out there that's 44.1.
My prior Dac was a Yamamoto YDA-1 and it's in fact also my current Dac I bought it back from the person I sold it to 6 years ago. Though the design is SS there are some similarities both makers eschew a digital filter, the Yamamoto has no filter at all. The sound therefore has similarities in terms of naturalness and also vividness and rich instrumental color. The AN Dac seemed to have a longer slower decay of notes and is just a touch more laid back.
I look forward to getting my AN Dac at some point it is certainly missed!