I have the B&O 3D Surround system too and agree it is the best sound system I’ve ever had in a car. I find the quality excellent from the DAB and via Bluetooth. Take the time to set it up, balance, fader etc. When it’s cranked up the bass vibrates the interior mirror and there is no distortion or speaker rattle at all. I’m looking to trade in for a new Audi and will make sure I tick the B&O option box.....at the end of the day it’s only £20 a month over 3 years...... I spend more on beer!