I have the Formation Audio as the only Formation unit connected by digital out to a Lyngdorf TDAI 2200.
Roon works flawlessly, and was the main reason for bying the device. I am also using AirPlay to stream TV sound from ATV and Spotify + Tidal.
The sound is very relaxed, yet detailed and a joy to listen to.
As others have mentioned, the Bowers Home app lacks features. Lets hope the app evolves fast.