I've been playing around with ver 1.7 of Roon and like the improvements. The Live Radio feature is very good. Already discovered loads of radio stations worth listening to a lot. The 'New Releases' feature is spot on. Very much tuned to my library and listening history. Searches and general latency much improved.
No sign of external access (outside my LAN) yet despite rumours it is in the pipeline. I guess difficult to implement (although JRiver has it). In any event I can access my Library from anywhere via Tidal.
Current: [P20] Roon/Tidal > Custom PC> Chevron Paradox NDF16 > Phast Pre > Neuro. 686 > Tannoy Berkley (RFC tweaks)