I've only had the car 2 months and I had a tiny stone hit my windscreen on the M23; a little tiny chip, but it has cracked the windscreen and Autoglass couldn't get the crack to seal, so it's a new windscreen. Luckily they are going to provide OEM glass under the insurance, but it's a royal PITA, especially as I will have to get the camera calibrated and the windscreen coated again.