We've currently got State Farm for the house and to get a discount we had to add at least one car, the rest we've got with Progressive (which I love). Unfortunately, State Farm has managed to screw up just about everything they touch, from getting rates incorrect, to accidentally cancelling my wife's car insurance (the only car we have a note on and not a good thing if you have to find out your uninsured via the credit union!) Being she works there we got it rectified without having to pay some exorbitant mandatory insurance fee. Then after spending three hours with the SF rep at his office setting all this up, when the house renewal came in the mail, none of the improvements or options had been added. Still more phone calls and confusion, and more months lost.
I've got more to add, but not a lot positive ; )