The nice thing with our free market capitalist society, as opposed to a socialist progressive society, is that automobile insurance providers are in market marked with open competition for policy holders and customers. As such, you can always shop around and figure would which company you would like to send your money to in exchange for goods and services.
I've had Progressive, 20th Century (21st Century), Wawanesa, Mercury, Nationwide, AIG and others.
It always makes sense to spend a day or two calling the various companies and getting quotes. If you are organized, you can provide all of the information they need to give you a mailed or phone quote in a few minutes. Lets see, you need the VINs of your car/s, tickets you have gotten within the last 3 years, estimated number of miles for each car/s, number of years you have been driving/licensed to drive, and where the car/s are to be garaged.
I have no qualms with moving from one insurance provider to another, depending on their premiums. I think that my doing so provides a valuable service to the market in that it forces even more competition and lower rates. Now if everyone were to do this on a bi-annual basis...