I now consider myself an Arizonian. If you drive a lot on the 101 or 51 like I do, you'll get your fair share of chips on your windshield. You'll also have to replace a windshield like I had to do just recently. Apparently, chips and cracking windshields is common in Arizona. In fact, I seem to recall my insurance agent telling me that insurance companies must provide this coverage in Arizona.
I had a chip repaired about a year ago near the very bottom of the windshield. Just recently a small, very fine crack started traveling north on the windshield from the repaired chip (a different vendor repaired the chip). I called these guys over to my house and they said it was too long to fix, so they replaced the whole windshield the next day.
What great service, they come out to your residence or place of business to repair or replace your windshield.