I think it depends on depends on what you listen too if you are happy to listen to MP3 or spend a fair bit of time listening to talk back then the standard system is fine. But if you are can hear the difference between 3RRR & 3JJJ then the Factory upgrade is worth it. I have upgraded all of my car sound systems this one was the first that nailed it for me. ( not to say that that the software can't be improved. The software controls definitely has to be upgraded. 3 band EQ is a joke. )
But the cost of the upgrade is less than what I've spent on my aftermarket systems. And as I mix sound for a living then I can justify the cost.
Here is some info
Go to page 3 for the english version.
http://www.s1nn.de/system/uploads/a...-TechnischeInformationen_deutsch_englisch.pdf
https://pic.twitter.com/A5xA5TSCi0