Hi all - having bought a Mk7 Golf R with standard 80w system (and then returned it under the 30 day warranty next day as the paint had been resprayed both sides poorly and was picking off and going rusty !) - and then buying a GTI Performance same year, colour, age etc still a Mk7 with Dynaudio 400W system I would say its hugely superior - so much better in my opinion.
That said the standard system was acceptable - nothing wrong with, I just like more clarity and powerful bass under low volume .
100% worth the money personally.