I have had the ML system in my IS300h for the last ten years, the sound quality is incredible at any volume. It has 15 speakers and 835 Watts of audio power. I am listening to music again like it's for the first time, hearing notes, sounds, frequencies etc that I never knew existed when I originally heard the tracks/albums many moons ago.
Looking forward to my NX350h Takumi with it's ML system, 17 speakers and 1,800 Watts, total bliss.