I have been using a 502DAC (one of the early review units) for 2 years now, almost daily. At the moment I have LSR305 speakers directly connected to the RCA out and I digitally change the volume in Roon. I have been very happy with this setup although recently I mostly use it to play lullaby music to my newborn girl. Anyways now I have realtime PiCore distro installed as a Roon output. It doesn’t support RAAT but works very well. It was supposed to be just a test but I was too lazy to put dietpi back. Before that I’d used the 502DAC as an AES transport to my Yggdrasil and that time I had first RoonBridge installed for about 6 months then dietpi for about year. To tell the truth I couldn’t hear significant differences between the distros but dietpi was the easiest to set up for me (because it has graphical interface to set up wifi etc.) All distros worked without freezes, restarts, bugs etc. I had 0 problem with them and with the 502DAC.