Another nice feature in Qobuz is you can download the digital file for your library in full resolution - try this album if you like Blues !
That's definitely a great sounding album.
I can download tracks to a locally stored library via the Qobuz app on my phone or computer, but in Roon it seems that Roon just adds the metadata to its database file (what it calls your "library" when it is actually just the card catalogue). Roon says this is to allow you to customize album info or tags. I'm not sure anyone does that.
Is there actually a way to get Roon to put the a copy of the music tracks in the folder where you store your music? This would be truly useful because playback of locally stored files sounds better than streaming them over the internet.
Regarding Qobuz, it is fantastic. I would not consider any other service. Qobuz is focused on the quality of the music in its original, lossless format. They stream in an open standard, FLAC. They do not introduce gimmicks, distortion, and consumer-hostile or deceptive formats like "spatial audio" or MQA mumbo jumbo. Almost every track or album on Qobuz can be purchased from their store in full resolution with no DRM. Their prices are typically lower than HD Tracks, and they also offer a subscription, for an additional fee per month, to provide substantial discounts on buying music. It looks to provide a 30-40% discount, so it could add up to being worthwhile. I have not tried it, however.