They are very selective about what, who, and where they write.
The result of that conservative approach is very low rates.
In 33 years, I have only been able to beat them once.
That was for a total of $60/year auto/home combined on an initial quote from Liberty Mutual through my college alumni association.
Since they put me on hold for over 15 minutes to get that rate (what they quoted me initially was much higher,) + their reputation at the time for retribution upon renewals, I decided not to avail myself of their offer for the puny savings.
During the 33 years, I have shopped both policies every two years.
The last time that I got a bid from a State Farm agent, he actually admitted to me that he carried his personal policies through Erie.
I've been very happy, so I stay put.