It's odd - I've clearly been lucky with windscreens (up to a point!). I managed to get through 4 years in a Vauxhall Nova, 2 years in a Rover 600, 3 years in IS200 #1, 5 years in IS200 #2 and 11 years of the 12 I had my IS250 without having anything more than a chip. Then the cracks started! Both stone hits on the ES's resulted in instant cracks. I don't know it's because both hit right at the very top of the screen perhaps? The crack on my IS250 started after a stone hit the very left hand side of the screen. Are edges more susceptible to producing cracks than a smack in the middle?