Thoughts on JRiver Media Center? Anyone using it?

I still rely on JRiver although I occasionally use others.  I do renew it but it is not necessary.

windows media player has good sound.

I too still use JRiver. Great for my large catalog of WAV, CDA, FLAC, HDCD, DSD, DSF. UPDATED frequently and not very expensive. A+!

Both Tidal and Qobuz can be played inside Roon, I feel that Qobuz sound a bit better than Tidal, but Tidal’s integration with Roon is a little bit better.

You have a great system. I recommend a high quality streamer. This will get you sound commiserate with the rest of your system. PC / notebooks are too noisy, not built for high quality sound. Like all audio components, you generally get the sound quality you pay for.

Also, if an nearby Ethernet connection is a problem, just get a wall wart wifi extender and plug in behind your system and run an Ethernet cable into that.