I have had some good times, but a ton of drama with folks who hadn't heard of poly. They all ended up deciding that poly wasn't for them and they wanted monogamy and, since it couldn't be with me, they either ended the relationship or cheated on me with the person they thought they wanted to be with (it has happened twice now). My most successful to-date (still going strong!) knew all about poly and wasn't in any doubt.
But those are just my experiences - sounds like you are potentially on to a great thing!
"Listen, or your tongue will make you deaf." - Native American Proverb