Florida, Kentucky, South Carolina mandate the repair by comprehensive insurance coverage without a deductible because they have found that driving with damaged windshields is dangerous, this is an advantage of comprehensive coverage in these states. This being said, most insurance companies will waive the deductible in the case of a glass repair, so it is worth calling your agent or representative to know your conditions.
The Insurance Information Institute suggests that you take the amount you'd pay in one year for comprehensive and collision coverage, and multiply that number by 10. Is your car worth less than that number? Then comprehensive and collision coverage might not be a cost-effective option for you. In other words, you might want to talk to your agent about whether it makes sense to include these coverages on your car insurance policy.