Hi all, first post here so go easy on me.

I've recently bought a 58 plate 2009 A3 1.9TDIe for getting to and from work and was looking to upgrade the speaker system. I've been offered the Bose speaker system upgrade but was wondering if anyone could let me know if it is an involved process swapping everything over?
From peoples experience, could I run in to issues? ECU code issues or anything like that?
Is it worth swapping them over? Is it that much of a noticable diffference?

Any helpful comments on this would be great.