I've heard they're unreliable and expensive. I don't fast charge much, but when I do I usually just hit a Tesla station and use the NACS adapter for my Polestar.

Electrify Canada was overall the best experience, though. No nonsense with installing a stupid custom app and setting up an account. Just tap credit card and go. Got full 150kW that my car can take. No hassle. Ate a burrito and returned to 80%.