Not quite the same but related in any case. My wifes 2006 Polo GTI had a brick thoown at it from the wheels of a skip in Dec last year. Put a big enough crack in the windscreen that it needed replacing.
Our insurers are Esure and they use Autogalss. Contacted them and told them it was a Polo but that it was fitted with then sensor at the top of the windscreen for the auto wipers.
When they first turned up, they had a generic windscreen (definaltely not a VW unit) but this was without the sensor (even though I took the time to tell them it had one)
Anyway when the turned up 2 days later (with the correct windscreen) it was a genuine VW piece. I checkd the markings on the Glass and the manufacturer, part number and everything else was identical to the original glass. The only thing different was that it didn't carry the VW logo. When I mentioned this to the fitter, he told me that the galss company wouldn't supply Autogalss with a logo'd screen because of copyright issues. However he showed me that when I looked closely, where the round VW logo was on the original screen, there was a round mark on the replacment in exactly the same location.
The fitter told me that the screens with the sensors are genuine and only the ones without sensors are copies (however I don't know how true this is). Since fitting the new screen the auto wipers have performed as good as ever and generally everything is fine.