I've had Hagerty insurance for some time now, but am pretty disappointed with their price increases. Last year I said something to them about it, but they were firm on their rates. I found someone cheaper at the time, but due to some circumstances, stuck with them for another year. Now my insurance is set to renew early next month, and they want nearly $1,500/yr for my car. I shopped with Grundy, and they are nearly 1/3rd less! I am in the process of getting that switched over now. Hoping they will be as good as Hagerty has been (minus the ridiculous price increases).
As far as track insurance, I have used Open Track. I don't track enough to do an annual policy, so I insure for each track day I do. Thankfully haven't had to use it, but the added insurance is piece of mind!
'07 Exige S - Graphite Gray
'14 Scion iQ (to park damn near anywhere)
'17 Lexus NX200
'17 BMW M3 6MT