FWIW, here are my experiences with ROON via a BDP3 and BDA3. The music was ripped CD's uncompressed (AIFF) stored onto an SSD installed into the BDP3 and Qobuz.
The BDP 3 has built in WiFi. I did the ROON 60 day trial included with the BDP3.
When using ROON, the ripped music files have to come from the Core, the BDP3 cannot be used as a Core.
The first attempt was to have everything ROON on a MacBookPro (Core/Music Files/Control). Everything was WiFied to the BDP3. The SQ was very lacking compared to listening to the ripped files and Qobuz directly through the BDP3 via The Moose.
I then moved the ROON Core to a desktop computer connected to the router via Ethernet. The laptop was used just as a remote to control the BDP3 through ROON. While this set up was a big step up in SQ, it was still much less than listening directly via The Moose. Both internal ripped files AND Qobuz.
Perhaps using a dedicated ROON server and having everything hard wired opposed to relying on WiFi might have closed the gap. Then the use of various audiophile "dingle-berries" including Ethernet Regan/Gigafoil/upgraded power supplies and four figure power, USB, Ethernet etc cables all around would provide an additional boost.
In the end, too rich for my blood and in my experiences, diminishing returns at best anyway. The Moose is great sounding and very stable. Personally, I'd like to have better Qobuz integration- similar to Amarra where ripped files can co-exist with Qobuz favorites. Qobuz selections in "Artist View" would be nice. Let's see what lies ahead.
Enjoy the Sounds,
John