The REW integration has worked perfectly for me for the past 3-4 years.REW integration was, for me at least always on the flaky side, but saved a few minutes when it worked.
Roon ‘ready’ is useful but add a streamer to a pair of C8Cs and you have the same functionality and saved thousands of ( the currency of your choice) pounds.
Keith
The D&D phone app seems a little "slick" for my taste, but the functionality has been fine.
Roon could not usefully sort my library of ~20,000 classical discs, so I dumped it and went back to Foobar/JRiver.