Got my Rivo today.
Setup worked like a charm, after 10 minutes everything is up and running, Qobuz connected, music from external SSD indexed, no problems at all.
I connected it to a Heed Obelisk DAC, both via USB and Coax S/PDIF.
The sound quality via USB is comparable to my Raspi4/DigiOne combo.
The amazing stuff happens via Coax S/PDIF: very musical, precise, transparent sound, less rough edges.
An almost “analog” soundscape (I listen analog a lot, too), natural experience.
Of course, the differences are not gigantic, but they are clearly noticeable, and I confirmed with a direct A/B comparison.
In summary, I am very happy with the Rivo, it is clearly worth its money.
Kudos to the Volumio team for making a great product!