I was a skeptic about the sound quality of Tidal and Qobuz streaming vs. CD and/or playing FLAC files from a NAS device. I still have the capability to access music from all of these sources and spent some time initially comparing the sound quality from various sources. These comparisons were tedious exercises that seldom revealed any clear cut "winner". In my personal experience I have not experienced any difference in sound quality between the various sources. The access to a vast library of music via the streaming services, in CD and hi-res quality, has transformed my listening habits and has greatly expanded my music selections. I still have my CDs, FLAC files, and LPs and have no plans to give them up but I must say the sound quality of Tidal and Qobuz is impressive. As a previous poster mentioned, I think the quality of the DAC and/or streamer is a significant factor. I am using a Lumin T-1 streamer/DAC.