I can review sound quality (Voice calls only) on my two day old phone. First call was to Samsung for a purchase of the insurance. Call quality was so bad I had to ask a number of times for the rep to repeat herself. She gave me another samsung number to call, and the call was better, but still muffled.
Immediately called my brother with a Bose bluetooth headset, and he and I heard each other very well, no distortion. Called a few other numbers, and all calls were clear with, and without the headphone. Call to Samsung must have been a one time event on there side since further calls to Samsung was much clearer. No other issues.
Sorry, no music quality reviews.