After trying everything else on the face of the planet, my horse goes xc in the mikmar combo bit. It's amazing for him because he likes to get his head up and get strung out and this keeps him forward, round and I can collect him very easily and remain soft. I wish I had tried him in it when I was riding him at intermediate. It would have saved me a lot of hassle! But he's really great in it.
I don't know about the 2 ring, it's a different mouth piece.