A great expansion to one of my favorite games. Adds a lot of good depth, new strategies to winning, as well as a more balanced game that puts less emphasis on being first in turn order, and the need to always grab wood when available.
Still my favorite game of all time, though my wife struggles with the mid-game where you get the "need to do everything" syndrome. I really enjoy the seach for a more efficient plan to accomplish things.
Really fun coop game, is really popular in our group, and a nice end of night game, so that everyone can end the night as a winner (you may need to play more than once to make sure you all end on a win)