Won my last 2 immortal games in G&K. I feel like it made things much easier, by mid-game I was already out-teching the AI, by the end I had GDRs and the most advanced Civ only had basic infantry. Second game was a space win by 1909. I think it's the new tradition policies and the fact that happiness isn't a problem any more that makes it so easy to destroy the AI tech wise. Buying great scientists with faith is pretty neat, too.