Lexan windows on the street?

I always find it obvious because it's flat and not rounded. when you see a windshield that's flat and doesn't Contour to the rest of the body it becomes a little obvious. I thought about it but too much hassle replacement scratching I just paid the $200 for a new windshield and like it. a brand new windshield waighs quite a bit less than the original. Food for thought...