I've had Heacock for 5 years. Never filed a claim, but when Doug (shlby66) told me how well they handled his claim, I figured that I can't do better. Since SAAC now also partners with Hagerty I figured that I would get a quote as my policy renewed July 1st. Priced same agreed value and mileage for modified 68 GT350 and 2009 Bullitt. Hagerty was about 250% MORE per year than Heacock!
I would definitely shop around. Different cars, different driving records, locations, etc. will make a difference. Good luck!