I had Progressive on my boat, car, and home. I still have them on my car and home but had to go elsewhere for my sailboat. Once my boat was over 20 years old and over 40 feet, they would not write agreed value coverage and the best they would offer was about half of the value of boats of my manufacturer and model. A new C&V survey cut no ice. And their cost was hundreds higher than the new company that I went with. I'm not sure I ever had a claim with Progressive, but if I did it was for getting tangled in a submerged lobster pot.
Sad to say that yacht insurance is just not something that is once and done. Over the years I have seen renewals that were out of line and I had to change companies to get a fair price.