Nice, but quite expensive for what you get
As somebody who has >300 hours on EU4, I just about got my money's worth out of this. For me, the army professionalism and military drill features are very good and give the game more depth when playing any country in the world. (rather than only the countries on continent X or countries with religion Y ect...) I find the enhancements to the Muslim world nice but are only secondary compared to the drill and army professionalism features.
However, the drawback of this DLC is that it costs almost as much as a regular game in and of itself. If I only liked this game as much as I do on Civilization (