The first extension of Carcassonne is mainly intended for a potential 6th player, but I consider them as absolutely indispensable even with more than three players because one is a little less on luck due to the greater amount of cards and the specific cards and also at More players can still pursue a strategy.
Original this extension is not, she has essentially nothing new, but it makes the basic set with a few interesting players and extends the playing time a little.
Conclusion: good value for money, increased fun, a must for basic set.