USAA and Amica are the highest rated companies based on customer satisfaction and financial stability. USAA only allows military and their families (past and present I believe). Amica is a Mutual Company that pays dividends yearly as long as they are profitable.
Personally, I have had everything with Amica for 4 or 5 years and had 1 minor claim that was addressed very well. I was with State Farm for a very long time before that, and was treated well with my 1 and only claim (stolen vehicle). IIRC there are different divisions of State Farm, and I was with the supposed better one (low risk customers only)....this was according to my agent at the time.
For those that have been with any given company for a long time and are seeing their rates continually rise for no reason....It is now standard practice for Insurance Companies (and agents) to raise rates on those customers that they believe are not going anywhere (long term customers). Do yourself a favor and shop around if you haven't for a few years. Also, don't forget that you can shop agents too, as they normally can set their own rate mark-ups. (IE...the State Farm agent with the fancy office downtown is likely charging you more than the State Farm agent that works out of a trailer in the sticks would)
'04 GMC Sierra 2500HD, CCSB, D/A, MaxBrake, B&W Companion, Retrax Pro, AR Power Steps
2013 Rockwood 8289WS w/Diamond pkg
1969 Camaro RS/SS Convertible
Dad's old 1968 Empi Imp (recently recovered from under 21 years worth of boxes/dust)