It's a really fantastic supplement, and adds the option for more political aspects if you want, or if you don't, just some really cool headquarters for your players to make downtime actions, or to RP in before / after questing.

The followers are also just SO COOL. It's really neat to be able to play a rogue and have a follower who is a spy that can provide you neat information, or a Wizard with a follower that can make you potions, etc.