I've switched from Allstate to Farmers, which will save me a little over $150 per month (i.e., over $1800 per year). I still have the same components to my coverage (i.e., all three of my cars are covered in the ways they were covered with Allstate), so nothing was lost there. Additionally, get this, that figure also includes renters' insurance - meaning that, with Farmers, I have both car insurance and renters' insurance, but it's still $150 cheaper per month than just having car insurance with Allstate.
Farmers offered me a lot of discounts. For instance, I got 17% off of my car insurance for also getting renters' insurance through them (which basically translated into me getting the renters' insurance for free when you look at how it figures out), and I got another 10% off for having them automatically deduct payments from my checking account. I'm sure there are other discounts that I didn't get for one reason or another that would have resulted in even lower premiums.
I figured I would share this here since, well, it seems particularly relevant and it may result in you saving some cash. Of course, many of you may be exceptionally content with the insurance you have now, or Farmers may not be able to save you that much. But, I figured, if you're like me, then your of the opinion that it never really hurts to look into it.
I worked with Michelle at the Farmers office in Groveport. The number there is 614.491.4401. She was very helpful and, if you wanted to know more, then I would recommend calling her.