What are your experiences with polyamory, first or second hand?

I personally am in a phenomenally stable polyamorous relationship. I've been married to my wife for 12 years, and she has had the same boyfriend for about half of that time. It's a really fulfilling arrangement for all of us in various ways. We're all genuinely happy and satisfied. I'm kind of casually looking for a boyfriend of my own.

But I feel like I only hear negative stories about other poly experiences. It's always unstable people and situations. It's always two out of three people happy at most. Surely there are other success stories out there, and I just hear the disasters because they're more memorable and fun to tell. Does anyone else have or know a polyamory success story?

EDIT: This blew up a little while I was asleep. I promise I'm at least reading every comment.

EDIT 2.0: ngl I did not expect the trope of polyamory to fix a struggling relationship would be so real. We did just the opposite and are both baffled. Don't use volitility to fight the volitility.