Anyone playing Civ V: Brave New World?

If so what do you think? I like all the new leaders that they have - especially the Shoshone and Assyrian empires (Shoshone might replace Austria as my most played), but the fact that it takes so long to research new technologies is incredibly frustrating. Also the way they changed the conditions for cultural and diplomatic victories is interesting, but it can be very nerve racking if another Civ gets their hands on the world congress.