I have Safeco. Had one claim where I got a few gouges from rebar in top of stump and no issues with that claim. Payed for all of it and premium did not go up.
Only other time I tried to use was when I had all my tackle stolen while parked under my garage. They would not cover that because it was considered "unattached equipment not necessary for use" In other words, if the boat can be operated without it, then it's not covered under my policy. TM, lifejackets, stuff like that is. I checked around and found that all were that same at that time. That was about 3 years ago. They have been the cheapest in my area though. Hope this helps