I am a large supplier of Pilkington, PPG, and Safelite glass. As to where Pilkington glass is used in BMW OEM it is not the same as what I sell in the aftermarket. Pilkington has two different specs, OEM and A/M. As a dealer of Plikington I have never had a claim about distortion, Pilkington is a very good manufacturer of A/M glass. I would take back to the dealer and let them replace the Pilkington glass. If are still not satisfied get the OEM glass ordered. I have heard that the OEM glass costs nearly $1,000 USD though!!