Hi JLM. Thank you for the questions.
The unit was purchased about 3 years ago. It is a current model for NAD.
I will update the software this week to bring it up to the latest available.
I have compared this to the following DACs:
Lampizator Big 7
Bricasti Design M1
Vinnie Rossi LIO with DAC 2.0
MSB DAC IV plus with Diamond Power Supply
I did not get to compare all of the above to each other btw.
I will start with the easiest comparison: Bricasti vs NAD. My wife, who has zero idea of any cost difference between the two, and I both much preferred the NAD. This has been a while ago, so I won't go into too much flowery language. But, we both clearly preferred the NAD.
The Lampizator sounded better than the NAD, but not by as much as I thought it would. And the NAD just plain works and has all the connections that are important to me. Plus the remote on the NAD is WAY better. Again, important to me and my wife, others may not care about the remote. Ultimately I sold the fine Lampizator and kept the NAD.
Now it gets the competition really gets tough. Vinnie's DAC 2.0 and the MSB are clearly superior to the NAD. Better extension, clearer highs. More musical.
I hope that helps.