I'm not sure if there is more than one BOSE version, but a 54-plate and 06-plate S-Line I have heard (with single DIN Concert radio) don't sound much different to the standard Concert system in my 56-plate TDI (which to me sounds great for a factory setup!). The only difference I've noticed is that the BOSE seems to have is very very heavy bass (to the point of being annoying) on volumes below 10, turning it up louder and it sounds no different to me.