FWIW I've had a fully pimped Joilda MK2, which is now gone. I've side-by-sided this to the 851N. The DAC in the 851N is no slouch and it's a hair's breadth between them.
I've now got a D33. I actually output the 851N to the D33 as I prefer this. However, the 851N is an excellent and highly versatile box of tricks. I could happily live sans separate standalone DAC as the 851Ns is decent.
They actually made an Azur DAC, from what I understand the 851N is exactly the same a this with a streamer bolted on, hence why it's so good.
Things have come and gone in my system, the 851N stays and will stay.
I may at some point if the stars align and I'm not so bloody skint jump to an Edge NQ.
Imo there is nothing to compete with the 851N at this price point.