This expansion is a must have if you intend to play with 5 players - it allows this with just a few modifications to the base play. The other great thing about this expansion, is that they have actually listened to the players and made some adjustments to the cards of the base game - this is extremely important, since it really fine-tunes the game and removes some of the issues that show up after several plays. I would not want to play the game again without this expansion.
I am a huge fan of Saint Petersburg so I had to have this expansion. Actually this box contins two expansions. I have only played New Society so far but it will be a permanent edition to any game of Saint Petersburg from now on. I love the new type of worker, the balanced replacement cards and the new trading cards. This expansion adds enough to the game to make this a good buy and change up a great game to be even better.