Extra functionality in what way?
The stock Golf one integrates into the car and can open and close with the windows via the remote and auto rain close using the rain sensor for the wipers.
As far as reliability I doubt that an after-market one will be anywhere near as reliable. It requires extra switches and controllers unlike the oem one and requires drain lines to be run down the A and C pillars. The roof lining and a pillars all have to have their trim removed along with the sill trims. The bracing across the roof needs to be cut out, the interior lights need to be relocated back above the rear passengers (not sure how the installer goes about extended the flat ribbon cable in a reliable manner). I'd also bet that the installer doesn't purchase the correct roof lining from VW. And as for a rolled edge I don't see how this can be done correctly without cracking the paint.
If you like products that don't integrate in well it sure does, there are many benefits that came with using the oem head units and the RNS 510 can't be beaten once you look at all the issues with the after market units and the cost to fix these problems.As for Sat navigation - http://www.vwwatercooled.org.au/newf...ad.php?t=42091
thats kind of on a topic .... Pioneer one looks very good
Other than the problems with the battery being drained, poor radio performance (VW headunits have a diversity aerial function) and poor integration with other parts of the car they also don't integrate with the MFD. MFD integration offers sat nav instructions, a compass all the time, street names, audio information including radio which means you can display different information on the headunit and the MFD at the same time.
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