For what it's worth:
My cars etc., are with USAA, and they contract somehow with Progressive for motorcycles. So I've got Progressive.
I told a Progressive person on the phone (I think they were doing a survey; can't remember the circumstances, that I didn't like being insured by Progressive because of their founder's far-left, anti-American political opinions and actions. And I was disappointed in USAA for hooking up with them She said that guy, the founder, hadn't been with the company for many years (20 or so? can't remember).
Last year, somebody pushed by 2009 Concours 1400 over in a parking lot. Lots of damage. Progressive was prompt, generous with a settlement, and I could not have asked for better service.
Also, the suggestions to get quotes is good. My insurance is $547 a year, for $500 deductible Collision and Comprehensive, and Liability to others B.I. and Prop. Dmg. 250k/person/$500k each accident, Uninsured motorist same, Underinsured motors same, and $10k medical. Also $3000 accessory coverage. And roadside assistance, which I've called to check them out, and they seemed to be very good.
I think I'm paying too much (I AM paying for all those INCESSENT commercials, after all.) But I like USAA.
Get some quotes.