What B&O speakers are you / will you be playing out of in your various rooms?
If its a bunch of single point speakers, like the BS2 / A9 etc, then I wouldn't bother with getting a dedicated Roon ready hardware to make them RAAT capable. Any advantages of RAAT aren't that significant on those types of speakers, in my humble.
As for the multi room experience, why bother using the B&O app / Halo at all? Doesn't really make sense with a Roon setup to me. You won't get any metadata, nor content selection ability - just an ability to join other rooms to something you've started using the Roon app.
In which case, and if you're using a bunch of single point speakers, you can do all of that using the Roon app (be it via AP or CC).
Jumping between the Roon app and then to the B&O app / Halo seems a fractured experience to me.
Oh, i got it. Roon receiver will have superior audio quality over airplay.
Chromecast isn’t an option as i’d like to be able to use NL. While technically, i could do this via CCA with line-in, i prefer not to use a discontinued product (i’m selling the four i have).
To get the higher quality, i’d need to connect a roon receiver to the line-in of a NL product, which i can then extend to the rest of the place. Downside is that it would add an extra device and cables. And it would limit me to starting the stream on only one device.
And in either case, i couldn’t see metadata in the halo or true b&o app. It would either just say airplay or line-in.
it’s a pity the roon developers ruled out dlna support, which would allow to display album and artist name on b&o devices.
I’m in my second trial week. Will need to decide in a few days whether to go for it or stick to plex...