In Europe, if your car goes to a VW dealer, "the fix" will be applied whether you want it or not and it will not be reversed even if you didn't realise this, didn't want it, don't like what happens next [see below], and subsequently complain.
On the 2.0 Tdi there are now reports of poorer performance with distinct hesitations, worse fuel consumption, much noisier engines, exhaust vibrations, and, on autos, earlier and inappropriate engagement of higher gears at too low revs.
So, if "the fix" comes to a VW dealer near you, find a good independent and stay out of the clutches [sorry, couldn't resist it!] of your "friendly" VW dealer at all costs!