Here’s a knowledge base article: https://kb.roonlabs.com/Sonos
We don’t have any particular support from Sonos the company. We use the same basic mechanisms that the official Sonos apps use to control Sonos devices, so we have approximately the same capabilities the official apps do. We do support lossless streaming up to the limits of the hardware, which are 48kHz/16bit audio.
We use the same mechanism the Sonos app uses to group multiple Sonos zones/devices, and can play normally to Sonos stereo pairs. Unfortunately it is impossible for us to group Sonos devices with any other devices by other manufacturers.
I’m the developer responsible for most of the Sonos support, and am happy to answer any questions, especially anything that isn’t in that KB article.