I use EASY AI FOR PLAYMAKER for second half of Shadows Peak which is more action focused.
http://store.steampowered.com/app/359940/You've probably seen my review on asset store. If not, here it is.
Before I've bought Easy AI I've tried using 5 other plugins for AI creation. Unfortunately most of them have serious disadvantages.
Easy AI is my favorite AI system out of every AI system I've tried. It's pretty easy to use and allows me to use my favorite tool (Playmaker) to build AI logic. Also developer responds super quickly and implements requested features super fast.
I'm defiantly happy with this purchase.
The only problem I have with it is a bare bones documentation. For example I had to spend a lot of time trying to figure out how exactly CAN HEAR OBJECT works.Don't expect, that it will make it super easy to implement AI in your game, it is still a good amount of hard work. But it is the best solution among many that I've tried and I do plan to use it in my next project.
I do have Advanced Battle AI, but I didn't go deep into it, so it might be good, but I didn't have the patience learn it. I did give it a try and I was disappointed, but I don't remember why.