I've been with Progressive for years. Got great rates. No claims so I can not attest to their work there. Prior to that I had Foremost with all good experiences. When I lived back in the midwest, I was insured through Dairyland. They were very customer friendly.
Since claims for me are nearly nonexistent, I look for the one with the best motorcycle towing package. Also, when I had the Harley with Foremost, they had a clause that allowed for replacement of not only the bike but full value of all the custom accessories which is NOT standard on most policies. It can make a big difference if you have a lot of aftermarket (i.e.: saddle bags) that cost a lot to replace.
"Yes. It looks insubordinate, but it isn't really." - T.E. Lawrence