For me, it is working excellent, I almost never check the spam directory for false positives, and it happens maybe once a month for me to receive a spam message in my inbox. I think it is comparable to Gmail, maybe a bit better.
This is the big one for me. I've tried moving away from gmail several times and everyone elses spam filtering has been utterly awful in comparison.
I use fast mail and still have my legacy Gmail.
I don't get spam on either. Gmail account is from year one, fastmail account predates that (~27 years old), so they both receive plenty.