They were my first insurance company, and after a few years I switched after I realized they were charging me almost 40% more than everybody else. Their service was excellent though when I needed them.
I used MetLife (group discount at work) and they had excellent service as well (for auto and home, both which I unfortunately had the luck to need).
I am currently with Farmer's, good price, and we really liked our agent. We switched to Farmer's to get a more "personal" experience, but the agent left them, so we are currently planning to start looking again.