Actually, my Mac Mini is from 2011. It has served me very well and I have enjoyed iTunes/Pure Music/Tidal/Qobuz/internet radio. The age of the Mac and one particular issue with streaming high resolution files prompted me to look for a replacement. The Mac's built in fan would kick into high gear with Qobuz hi-rez files plus be so loud that it would be easily heard across the room. In addition, the OS could no longer be upgraded and I was not able to try out Audirvana Studio.
I read the very positive reviews of the MS-6 by Pez, Tyson and Jmolsberg who upgraded from his Mac Mini / Audirvana. This led me to contacting Rich about an in-home trial. Rich was very responsive. He actually sent the MS-6 with the USB driver for my Sonnet Morpheus DAC and Audirvana Studio pre-installed. All I had to do is register with Audirvana for the free 30 day trial and connect my USB-C SSD (iTunes files). Audirvana Studio integrates local files with Tidal/Qobuz and internet radio. There is also a great phone App that functions as a remote.
From the get-go the MS-6 was as mentioned by others very musical, transparent and noticeably less noisy than my prior set-up. One caveat is that I wasn't using Audirvana before. Tidal/Qobuz and radio were all streaming using the MAC OS and Safari. Overall, I'm very happy with this set-up and think that it is an incredible bargain. Highly recommended!