My opinion of GEICO in general is that they are an average insurance company. Sure they have funny ads. But they are simply a middle of the road auto insurer. Thus, they'll likely be quicker to pay you for a diminished value claim than a terrible insurer like United Automobile Insurance Company. On the other hand, expect GEICO to put up a bigger fight than insurance companies with a better reputation like The Hartford and Nationwide. However, don't expect GEICO to immediately honor your diminished value claim. And one thing is for sure. In a state like Florida, if GEICO insures your car, it never has to pay you for your diminished value claim. On the other hand, if GEICO insures the at fault car, it may have to pay you for your diminished value claim. You need to give GEICO proof that your car has lost value after the accident. If you give GEICO proof of your diminished value claim, and they still don't pay you, file a consumer complaint with the department of insurance. I have filed requests for insurance assistance against GEICO with Florida's department of insurance.