This adventure is probably the best I've played since I started pathfinder in s0. It does need a GM who's experienced and has studied the module beforehand. It's not the easiest module to run, and nobody is going to have fun if the GM lacks the required experience or dedication to run it.
It also needs different mindset than "Durr me hit ogre hard" from players. Hack n' slash adventurers should just stay away, as you might ruin it for the rest of the players, and get bored as you do so.
The scenario has well thought out characters, a good plot that can be modified depending what sort of characters and playing, and many possible outcomes on what happens in the end.
I wholeheartedly recommend this for any roleplayers out there who want modules that are "something more", not just your regular dungeon crawls where box texts are read with a blank stare until the next combat starts.