Interesting that when Car & Driver tested a 2015 Passat TDI with the old software vs. the revised "Stage 1" fix, the difference in overall NOx emissions was very small. The one car was better in the city cycle and worse on the highway, and the other was the opposite. 

It pains me to say this is a 10-year TDI owner, but I'm through with diesel... at least as long as I live in an ozone hot spot in this very polluted city. Have you seen the mountains the past few days? Wonder why not?