Sound: Sound quality is pretty decent - I am comparing it to playing music from my phone speaker which would be my alternative. And after them explaining how to use the brush cleaner correctly, I absolutely fell in love! I have wide feet, usually wind up buying size 10. First, let me help clarify that the price of $40. Sync is easy. Ive had/tried many other pillows and this one is perfect for me (I sleep on my back). I AM careful not to rip the vinyl in the cold. The bass is a full body punchy bass. Note: They run very small. Les dió el sol y se encogieron unas partes, se curvearon y se despegaron, las pegué de nuevo y se ven deformes