I worked with insurance companies in my last job and Erie was without a doubt one of the easiest to work with. They didn't put their "insured" through garbage and always paid out on their claims. They were always a pleasure to work with. I wish they would expand beyond the Northeast.
I have Erie in Southwestern Virginia and have been very happy with them. They treated my 85 year old aunt great after her car and house were hit by a tornado. I was an insurance adjuster for 31+ years and one reason I retired early was the way my employer changed toward how they treated the policyholders.
I don't know how much more Erie will expand. Since I used to work cat. claims after tornados, hurricanes, etc., I asked them how they handled claims when a natural disaster did a lot of damage to their policyholders. They said they kept their rates low by being careful with who they insure and that they didn't insure properties in areas that are disaster prone.