For me, the most interesting thing about Qobuz Connect is its ability to switch end-point players mid-stream. For example, I'm playing a track on my phone using my headphones while out for a walk. Then I go through the front door while halfway through the song and switch playback to my main stereo without missing a beat. I could even go to a friend's house, who does not have a Qobuz subscription, and play my Qobuz tracks on his stereo if he has a QC compatible streamer connected to the internet.
While interesting, I really don't have a big use for this feature. I also don't hear any difference between QC and my other playback program options -- the digital music stream still has to travel over the internet direct to the player. QC is a nice way to select and play music, but it is limited to only that. It has no way to play from your local collection.