Auto-Owners...decent company. Note that they will all cover you...what counts is what happens when you have a claim. Like all insurance companies, they "like" to cover some things and not others, but they have been around along time, and the agent is not a one pony show. They can go to bat for you and the company often times lets the agent take care of simple claims where the one company agents don't do the claims and you get switched to a claim's service which may or maynot be best for you.
Insurance is only good until you put a claim in....that is when you find out if you made the right decision often years ago, in picking out a good company. There is a difference.
I like an agent that has many companies and who can be on your side if you have a claim; cause eventually you WILL have a claim.