Maybe others have different experiences, but I personally have no respect for Progressive. When I bought my 1991 limo, which is just my personal car, no commercial use at all, I use it as my daily driver, so it wouldn't be eligible for collector insurance, I called Progressive for a quote. One of the first questions they asked was "Is it more than ten years old?" When I said "Yes", they said they don't insure old cars and they hung up on me. So, with that experiece with their customer service, none of my money is ever going to go to Progressive.
I also have no good to say about Geico either. I had been a Geico customer since my first car in high school, simply because it was the firm the parents had always used. As I started buying hearses and limos, I just kept adding them to the Geico policy. Even though I never had an accident that was my fault, and never made any claims, after about ten years of being their customer, I received a letter from them saying that they were not going to renew my policy when it expired. Of course I picked up the phone to find out why. I was told that they don't insure custom cars. I said "What are you talking about? My cars are all stock, and you've been insuring them for ten years." Their reply was that they were not the way they were when they left GM, and they are not going to insure them any more.
After that, I called Allstate. Allstate not only said "No problem", but also turned out to be cheaper. I finally took out a Hagerty policy, which I've been very pleased with, when my collector cars reached the age of being legal antiques, but I still have my daily driver policy with Allstate, and even my parents, after being Geico customers for decades, couldn't believe what they pulled on me, and switched to Allstate too.