I use Volumio on a Raspberry Pi3B+ with a DAC on top of it. It provides very good sound quality and is very fast into scanning my files library (lots of gigabytes of FLAC files). I'm using my phone to control it and this works flawlessly. Sometimes, it loses the connection, but I suspect this is linked to the phone and its OS rather than to Volumio. Only thing that required some learning is the powering down, as for all Pi's it needs to be properly shutdown to prevent SD corruption. For me, no issue... The family had to be trained though :) If I may mention one area for improvement: the startup sound is very low (much lower than the music it plays when fully started), and there is no shutdown sound. As I use it without screen, it would be good to be able to tweak the startup settings and add a shutdown sound (use my own files by placing them in a special folder, with specified names and allow for a volume level). This way, I know when it started and when I can power it off. I've seen a script allowing for that, but this is not so user-friendly.