I have had some time to listen to John's dac and have to say it is wonderful. Setup was easy with Jriver. I just needed to download the kernel streaming driver and select it in Jriver's settings. MQn was a little more difficult but was not too bad once John sent a link to a dropbox with all the files I needed to get it working.
The sound quality is among the best digital I have had in my system. I prefer it to some recent digital sources I had which were a Modwright OPPO 105 and before that a first generation Linn Akurate DS. I did not bond with the Modwright for some reason. Might of been a synergy thing. I had the Linn Akurate DS for a few years and enjoyed it but it was kind of sterile at times and I usually preferred to listen to my vinyl.
More recently I got in two dac's on trial after selling the Modwright OPPO 105. The newest Benchmark DAC 2 L (version without headphone amp) and an Exasound e20. These were similar in sound quality but I found the Exasound to be slightly more dynamic and a touch better in reproducing cymbals. I found the Exasound's software and features to be better than the Benchmark as well. I sent the Benchmark back even though it was very close in sound and was cheaper in price. I did not care for it's display and the blinking lights.
Enter the Ciúnas DAC. I received it after I got home from RMAF. It is small and unassuming but really performs like a heavy weight. At first listen it was very similar to my Exasound which I had found to be the best digital I've had so far. With time I heard small differences. I found the Exasound to be slightly more resolving in the highs. The Ciúnas was slightly smoother and maybe slightly more relaxing to listen to. I found that I could be happy with either one with PCM files.
If I had not just bought the Exasound and not had need of a dac with DSD capability I would be putting in an order for the Ciúnas. When I received the Ciúnas I was not aware of the price. After listening to it for awhile I got curious. I was surprised to learn it was only $750 US (depending on the exchange rate). I think John has done a heck of a job and at that price it's a no brainer!
I also have John's USB converter but have not tried it yet. I would be surprised if it could improve upon the USB input of my Exasound but you never know until you try. I'm just waiting for a BNC adapter to show up so I can give it a go.
I will be handing the dac and converter over to Gary Koh shortly.