Now the addon
It brings a host of new opportunities, many things have been changed, you need to get some other technologies to certain things, values were corrected, newly incorporated other things. A total of 9 other rulers, new wonder of the world, religion, espionage etc. Now the game is really extensive and the way you want it. Also offers new gameplay, because experienced players can Discover new things.
All in all a nice addon. While the 28 are in relation to the basic game price, which is now called, rather high, but I find it not unreasonable.
The only thing that annoys me after like, is this compulsory registration crap about Steam.