I got mine replaced with the rain sensor for $300 and he used Saint Gobain glass. Guy had 25 years of experience and did it perfectly.
I really need a part number for decent glass for rain sensor GTI. The dumbasses in my area can find every Golf glass made, and show up to my house with it, except the one with a rain sensor.
I've been driving around with a massive chip right in my field of vision for a year. I gave up and just had them epoxy it, but it looks just as bad as before they did it. At least it didn't spread I guess.