Before joining up with you, I played a game of this when I first arrived, along with the Inns & Cathedrals expansion. My downfall was when a giant city was completed that I wasn't expecting them to complete.
After Carc, and before Navegador, we played a 5 player game of this. None of us knew how to play so it was slow going at first, but was pretty cool. 3 of us went into bankruptcy in the final round, with the other two tying for being in the most debt. The tie-breaker was something goofy, which was whoever started furthest from the first player token of the first round. But it was fun.