Thought i'd toss in my 2 cents since I just had this done about a month ago.
Dealer quoted just over of $700 for the service, which was considerably more than I expected. I had previously been told $429 for the 40k service, but had not been informed about the $299 for the DSG service.
Luckily I know the service guy pretty well from my carefree maintenance, and had actually given him a few things for his Jetta I decided I wasn't going to use for my Golf.
He worked with me very fairly, applied as many coupons as he could and ended up performing the whole service (40k plus DSG, including all of the misc. "checks" I really didn't want to pay for) for $500 even. His name is Sal at Cardinale Way in Corona, and while I wouldn't expect him to give this price again, he is a very nice, reasonable guy to deal with.
With that being said, I will be ordering my very own VCDS going forward, which will more than pay for itself for fuel filter/dsg services.