I have had a Lexan for 20 yrs,,the double scratch resitant one. I used it with the wipers a lot..no scratches. I even had an accident in which a tree branch would have gone through and probably killed me if I had ha a glass windshield. I never have experienced vibration,probably because when installed in the frame I used Silicone all the way around..so it also does not leak.Over 100 mph you can see the windshield flex, especially if the mirror is mounted to the windshield. I broke 2 glass screens first befor putting in the Lexan. In SA we do a roadworthy....like the Aussies and I took a piece of Lexan and a 4 lb hammer and told the inspector to please break the piece...impossible... so they passed my screen and a lot of subsequent ones.
John
