We had the windshield replaced under warranty last month on my girlfriend's JK. No rock chips, just a crack along the lower windshield above the defrost vents.
2009 Black JK Unlimited X 4D, 4WD, M6, 35 X 12.5 X 18's
2001 Black Mustang Bullitt, bolt-on's & suspension
2000 Black F-150, 3.5" lift on 33 X 12.5 X 16's