Civ discussion: Incas

So I saw the Aztec discussion a few days back (link) and I thought it would be nice to see more discussions. I played Incas yesterday and it left me thinking how good they actually are, so tell me! Also feel free to share your good/bad experiences of them.

Some points for discussion

• Kamayuks. Are they good? Do you have any good experiences of them?

• Slingers. Do they have uses?

• Eagle Warriors. How do they fair in comparison to Mayan or Aztec Eagle line?

• Infantry. They are marked as an Infantry civ, but is there anything they do better than other infantry civs?

• Economy

• Strategies. What strategy suits Incas the best?

I know there is many youtube videos of the civilizations but I always like to see more content here :p