I also use Hagerty on my classic. I've never had a claim, but have heard good things from friends that have. It's a great way to save some money on old cars driven mainly for pleasure, shows, events, etc. If you live in a state that allows you to register as an antique you can cut costs more. My plates (registration) cost $50 for 5 years.
I'm in Canada, so maybe it doesn't apply but ING has something called a "silver wheels" program. I pay about $130 per year full appraised replacement coverage. It's a bit more if you have heavily modified the drivetrain. You need to provide a certified appraisal every 3 yrs (If I remember right). You can only use the car for shows, cruising, or transport to and from the car wash or places that perform work on the car. So if you get in an accident with the back seat full of groceries you'll have some explaining to do. The car must be over 25 yrs old, and no drivers under 25 yrs old are allowed to drive it.
Hagerty for me too, I have had as many three cars insured there down to 2 now, never had any claims but I am satisfied with the rates and the customer service has always been top notch.
Hagerty for me too. if you have a "project" or not clearly classsic collectable be sure to submit best possible photos when they ask. I have one low mileage mid 80's vette and it needed special acceptance. Also an older project car wasnt deemed collectible by them.