I am with State Farm, I have an exclusion policy on two of my vehicles. My fiance got a DWI two years ago and my insurance was going to triple with him on it, so we both signed forms stating that IF he was to drive either of my cars and gets into an accident, I have no insurance. I said fine by me. He has driven my newer car a handful of times, and I am normally with him. I do trust him, it is everyone else on the road I don't. But his biggest tiff with SF was that they were raising my rates nearly triple, and he has Progressive and it only went up $15/month. But I love my agent and am going to have a hard time leaving them when I move in July...
I have heard good things about Erie though. But that they are quick to drop you if you file a claim. That is just word of mouth though.