A great mod. I always use it when I play civ.
But there is a problem with a decision of The Maya - I think it's called "Improve Our Atlatlists", it's a decision that lets you spend 225 (on Epic) gold upgrade all your Atlatlists to Composite Bowmen.
IMO, the decision is way too OP, I literally built about 5 Atlatlists in 20 turns, and took on my neighbors because I rushed Construction.