First let me say what an expansion. This game takes nothing away from what was already a great decsion making game. The overall feel of the game stays the same, but allows for its players to now construct very synergized decks and adds an element of surprise and control over the center row.
We played only with the expansion last night at a 3 player game. The overall feeling is that we will love it once added to the main center deck.
I give this expansion an A+ in my book.
There is also a solo variant in the rule book I didin't know about.