I use them mainly for mixing, playing guitar and listening to music and I am very satisfied with the sound quality from these small monitors.
However, when you just have them turned on without using them for anything there is noticeable white noise coming from the speakers. It is loudest during startup (due to bluetooth initiating) and when using bluetooth, but it's always there in the background. However, you don't hear it during usage and it does not seem to affect sound quality afaik, which is why I did not bother returning them to be replaced. Also, when I retire these from the studio they will be great for other applications in our home (home theater sound, streaming music etc).