I always find it curious how people often have such a different experience with the same system. For my part, I've found Fastmail's spam filtering to be much better than GMail's, especially when it comes to those false positives: I would see ham in my GMail spam folder at least a couple times a week. I've mostly stopped perusing my Fastmail spam folder, as I still have yet to find any false positives there.

On the other end of things, GMail and Fastmail both miss about the same amount of spam that ends up in my inbox. Not a lot, maybe once or twice a week.

I wonder what it is about the emails you receive (vs. the emails I receive) that makes us see such different outcomes.