Ari's right that there's lots of success stories if you look around here.
In case you're feeling lazy
, I can share mine, though it doesn't meet your specs. I had a mono partner when I decided to admit that I was poly, and that relationship ended over it two years later (and because we weren't working on other levels).
These days, I feel like I'm living the poly dream: I'm in a big house with almost a dozen people, including my fiance and my boyfriend and three "it's complicated"s and a bunch of friends. We share chores, we go to the beach, we play board games. It's working toward perfect, every day, and I love it.