Hello Jeff and Lexie,
Welcome to our forum.
You might be interested in our Life stories and blogs board
, it has many stories of many people's experience in polyamory.
I think that as you add more people, the relationship tends to get more complex. Hence you will hear more "success stories" about triads than you will about quads, because a triad will tend to have less complexity. However, there are definitely quads out there who've been successful in their relationship and well-rewarded for the effort.
You will find many good threads to read on this site, and many good people to interact with. Post and let us know of your thoughts and questions, whatever they may be.
I'm glad you could join us.