If I could get a black box put on my 3 vehicles and save $300 every 6 months, I would jump at it. I feel like I am a safe enough driver that I don't care who knows it and besides, if the black box tells them that I am not driving safely enough, the worst they can do is not renew my insurance and then I can go with a company without a black box and pay more. But at least I will save money all the time I have the black box.
I had Geico for 25 years until I moved 3 miles down the road and they raised my rates $700 a year saying that I was moving into a location that had more claims. Then I switched to Allstate because their rates were the lowest and also had 10% more off both policies if I had my homeowners with them. After Katrina they dropped my wind and storm part of the policy and notified us that if we drop our auto insurance with them that they are going to drop the rest of our homeowners policy. Since no other company is writing homeowners poicies in our area, I have to stick with them or else.
AARP (Hartford) will write policies in our area without wind and storm insurance but they quoted me $400 more than Allstate.
A lady ran into my car 3 years ago and she had Allstate insurance also. The police found her at fault and gave her a ticket. Since Allstate insured both motorists, they said the lady was 90% at fault and I was 10% at fault so that they only had to pay 90% of my claim. Also, this kept me from dropping my Allstate insurance for many years because since I have an "at fault" accident on my record, no other company will insure me with the lowest premiums, so I will have to pay much more if I get a different insurer.
Allstate

Geico

AARP

Progressive