James,
I'm looking forward to learning more about BryFi. But I wanted to follow-up on a discussion I had with Gary at Axpona. I asked if a BDP-2 and a Pi player could be synched up as a part of a whole house system so the music plays uniformly and timed in synch at all locations similar to having multiple Sonos players. He indicated that both devices could access the same NAS library, but there would be timing issues and the music would not be in exact synch from room to room.
Would you confirm that? Perhaps I interpreted Gary response incorrectly. But if not, I'm hopeful that with what appears to be start of a Bryston whole house system player system, the timing issue for multi-room playback will be a priority to be included.
Nuz1,
to get at your question from another angle...i'd like to share how i've approached the topic, in part:
in system 1, i have BDP-1 and BDA 2 - and use Roon and external hard drive.
I connected a custom length Blue Jean digital coax cable from the coax out on the BDA2.
Then run the coax cable into system 2.
I have the flexibility of using using the bdp-1 from system 1 in system 2.
also, and i can listen to music with both systems running simultaneously - without evident delay.
makes for one very lively place with both systems running together! perfect for making brunch on sunday mornings!

hope this helps.
cheers, TJ