I've gone thru 3 polycarbonate windshields for the rzr, which would have paid for a glass one if I went with it to begin with. The poly ones attract dust like crazy. Static or something...and no matter how careful you are wiping them down, they haze up after a while because of it. Sun hits the haze and you can't see out of it. No wiper for when it rains either. So you end up hanging your head out the side to see. Real fun in the mountains in the cold rain/sleet.
SuperATV had their glass ones on for Black Friday 20% off. Got it in and installed it today. Has a manual wiper on the drivers side too. Small vent in the bottom by the dash.
This should cause a super drought, won't rain for 2 years now.