I agree with most of the comments here that the key value of Roon is in the metadata, more specifically the “serendipitous discovery” that the metadata enables (I have written extensively about that, e.g. here).
But when it comes to sound quality, a lot of people are “corksniffing”, focusing on minute differences among various software components. But the room and the speakers have a vastly greater impact on the sound. And that means that if you care about sound quality, Roon is a bargain for providing room correction, especially since you can tailor RC for each room where you play, and even for headphones.