I'm with allstate and sticking.
They did piss me off when I traded my 05 ram in for an 07 ram and the premium went up $700, but my agent lowered some of the limits and got it back within reason.
Reason for the stick is:
Great customer service. I know my agent personally, and can call anyday and ask questions, or have him change something.
Wrecked my 07 M8 last season, and allstate wrote me a check for $8500. I bought the sled back for $1100, and purchased an 08 M8 off the showroom floor for $8600. I knew all along that I was drawing a long straw here, and the claims adjuster acted like they were ripping me off, very apologetic, and going out of his way to make sure my life wasn't too disrupted by this. I played the role, but was smiling ear to ear when I left with check in hand.