Fundamentally, I'd recommend getting a shoe with a good midsole - that makes more difference than an insole.
I've tried the FP Gamechangers, and the Remedy Medic as well as the Destin.
The Gamechangers are decent; good arch support and relatively stiff while still being slightly flexible/giving some board feel. They last the life of a few pairs of shoes. I'd definitely get them again.
However, as others have mentioned, sucks the owners are cringe.
The Medic has a really high arch and is super stiff. There was almost no board feel at all. To top that off the impact absorption isn't that great - seems to transfer more impact shock to the feet than the Gamechangers. Others swear by them, so maybe I got a bunk pair? YMMV, but I wasn't too impressed with them.
The Destins have some impact protection and are very flexible out of the gate but don't provide much arch support. If you want some shock absorption without sacrificing board feel I'd go with these.
TL;DR - If you can stomach the Kooks who run the company, go with the Gamechangers.