I love the whip, but even I, who liked the building the first time I played as Monte and rated it as my in my top 3 in some random thread concerning UB's, had no idea how ridiculously powerful this is. I think on average it now translates into anywhere between +7->+10 happiness per city for me. And its 25% cheaper than its vanilla counterpart to boot! Lastly, it makes for one hell of a "final push" when you just whip all your cities down to wipe your opponent off the map. After my last game, it's going straight from top three to #1, hands down, no challengers. Love your terraces? Pffft. I'll take my sacrificial altar any day...