I own a Volumio Primo Hifi with a lifetime license for quite a time now. Soundwise it is all you can wish for! At first I used it with an analog preamp and therefor with its build-in DAC: excellent sound quality, nothing missed. I then swapped the pre for an RME ADI-2 pro fs and subjectively I could not notice a difference: the DAC of the Primo is outstanding... After I had update problems, which I could not handle by myself, Davide solved my problem online by means of a TeamViewer-Session. I am really speechless about the customer service: this is A-grade!!! And my apologies to Davide for me being such a looser in Linux things ;o). After the latest updates the implementation of Camilla Dsp works great so far: a must in my eyes to correct room anomalies! All in all there really is nothing to complain: outstanding sound quality and outstanding customer service. Highly recommended!!!!