The expansion modifies how some cards are played. It modifies one round for all of the players.

So the game gets a new rhythm and you need to recognize when its your turn to swing big. For players that are familiar with the game it is a very nice and fresh addition, totally worth it!
If the players are not really familiar with the nuances of the game it can get a bit tricky to handle, they will feel overwhelmed from the players that see the differences.

We really love the new addition