I'd like to run a game where kingdom building is not a sideline, but the entire focus of the game, essentially turning pathfinder into a turn-based strategy that can easily be played by email. I've read up on the rules found in Ultimate Campaign and was very interested in the potential. However, I was wondering how balanced these rules were, and if they worked smoothly? For example, is there some broken strategies or buildings that are vastly superior to everything else without any drawbacks (such as high prices)? Do 5 100 men armies handle a single 500 men army in a reasonnable manner?
So for those who have used the material in Ultimate Campaign, what are your thoughts?