I really enjoy this game. It has all good from Guild 2 Gold (that contains The Guild 2 and Pirates Expansion) and ..., Yes, many more added by developers in this standalone expansion. It is really worth buying - There are new professions for Scholar (gravedigger), Rougue (Mercenary which are "summoned" in mercenary fortress) and Patron Class, all exciting, new buildings to manage, new options in mansion menu ie. storing money in treasure chest. In this expansion process of advancing to the upper class in simulated society of players dynasty was rebuilt, for exmaple when You want to advance from (if I recall well) Free Citizen (one of new position) to Nobleman You have to gain required level of fame in Hanza of Your family - not only You need a cash to solve the problem, wchich is definetly good idea. Now city council sessions dont take so much time, because "social" options of contolled dynasty members like bribery, compliment are removed. You can still ie. bribe them, but now not during the council meeting. So ridiculous situations like when city mayor says "now we will vote the Guild Master office, there are such candidates in attendance (...) Oh, how generous, oh how nice, you wont'regret it" and so on. Its good that this was removed, because it took much time especially when player had opportunity to activate one of this options, and there was timeout, and there was no need to ie. bribe mayor and/or other council members because he/she/they was a friend to my dynasty and it only wasted time needed in other places in round especially, when 4-year round option was selected (Yes there is option to choose between 1, 2,3 ,4 - year rounds at game start - vide beta patch 4.17b, in stock there is only 1 or 4 year round to choose from).
There are many other tweaks and improvements. Graphic is beautiful and it looks better that in previous versions (however it never in this series was a problem - regarding version this game allways looks nice comparing to other titles published in the same time).
There is constant developer effort to fix exsisting problems in 4.15 version, so I would suggest applying beta patch 4.17b which removes many irritating bugs. Despite bugs it is real fun to play. If You like original mix of RPG, Sims, economic startegy It will be happy hours playing this game as I really enjoyed it.
My final word is - If You like The Guild 2 series, and its original idea is close to Your heart - I can tell You - This game is worth paying this decent price, "You wont regret it" ;)