My opinion of 7 Wonders is fairly low...but this expansion improved it quite a bit. It is still not a game that I will play that often.. but i will play it. Leaders add some reliable strategy to your game that makes you not so dependant on what other players choose to play. Each person gets 4 leaders of which they will play a maximum of three. One each round. They also have the option to discard for money.. but most times the ability is much better. If you buy 7 wonders... buy this as well.