The addon brings some hours of gameplay. A pity, I find that you can not expand the cities in the extensions.
Although it can be for all peoples of the Vanilla version, the long-term motivation is non-existent. After a few hours we'll meet only develop research. If you successfully and increases with the level of his hometown, so there are some nice and less nice new content. This, I felt, however, not as motivating genung to spend dozens of hours every nation.