(1) Givent he ubiquity of Sonos as an endpoint and compatibility with version 1.3, doesn’t it now deserve its own category under “Audio Products?” Audiophiles may cringe, but a lot of us have these things deployed around the house. Compatability under 1.3 was a huge win.
(2) I was initially amazed at the application of DSP to a Sonos zone and then something happened where I moved markedly backwards - worse that before. As it turns out, volume leveling appears to have been the culprit - in my experience - turn off volume leveling when using Sonos.
(3) Definitely notice that control of the Sonos transport is much more finicky under Roon control than the Sonos app - go slow and easy on it.