TLDR Get AudioLinux for an easy interface to technical settings and for personal support. AudioLinux is, as the name hints, a Linux distribution tuned for Audio. The website is pretty busy, with a huge amount of information that is not easy to absorb. I do not get a good sense for the product from the website. I got an understanding from buying it ($69 with a year's support) and using it for a few weeks. I used it on my own Pi 4 with a HiFiBerry Digi 2 HAT, and with the loaner Pi 4 with Pi2AES. The main difference between those two is the connectivity options to DACs. How do you install it See my earlier post Why would you use it? One reason is that it has a lot of scripts that allow easy setup and configuration of the audio hardware. I reached for AudioLinux because I was experimenting with HQPlayer Embedded and was frustrated with the official HQPlayerOS. AudioLinux made WiFi setup easy, and makes switching between configurations easy. So I have switched between configurations as an HQPlayer upsampler, Roon Endpoint, Spotify Connect - that's been great. There's also the ability to do CD ripping, use the Pi as a file server and so forth, but I haven't explored those. A second reason is the support. Piero is almost on-call and you get rapid response and great help with any query. I can see this being the killer feature for a lot of SBAF people. A third reason is because you believe sound quality improves with streamer software. AudioLinux has a lot of tools that let you customise the setup to be optimized for audio. It was pretty easy to setup my Pi so that it has core isolation with audio applications having ownership of 3 of the 4 CPU cores, and with the whole OS loaded into RAM for snappier response. Audio Impact Using a DAC with good SPDIF processing and reclocking, I have dived pretty deep into changing hardware and software configurations in recent months. I haven't noticed any meaningful difference between changes in streamer hardware or software, once they work reliably. The difference is on the magnitude you get by changing interconnect cables, the ambient temperature or the orientation to the earth's magnetic fields and personal chakras. The one exception is that you might get the streamer to run much better upsampling than the DAC does internally. AudioLinux runs HQPlayer resampling (PCM only was tested) very well. Usability impact I have greatly preferred using AudioLinux vs Volumio. I like the high level menu system and scripts for doing the big stuff, and access to a proper Linux distribution for other tweaks and customization. I also like that Piero has been there when I have questions. AudioLinux is not quite as polished and reliable as RoPieeeXL, which is probably the best 'set and forget' Pi installation for most users and is also free. Conclusion AudioLinux gives a neat interface for tweakers, and awesome support.