This book adds a plethora of new martial options for quite a number of classes, even unusual ones. From Occultist and Medium, to the good old Monk and Brawler, 12 classes get new and interesting archetypes to choose from.
Even more exciting is the new feats that add something more important than simply +1 to hit or an increase in damage dice, they add options. Options make combat exciting and let your imagination have a field day envisioning a halfling monk grappling and slamming a dragon into the ground so hard that it scares everyone else nearby. There are new actions you can take for nearly all the core maneuvers that allow for specialists to have quite a few different tools under their belt that are more than simply succeeding at their maneuver check.
In addition, the UnMonk (monk compatible) gets its first grappling focused archetype that lets you literally throw enemies multiple feet away from you while still dealing damage. Combine this with a couple of feats and you'll make them shaken and staggered from the experience!
Want to use that fish-tank as a weapon? What about that loose brick on the ground? Disappointed that improvised weapons are sub-optimal and typically not able to be enchanted? Well this is the book for you! The occultist archetype is entirely based around picking up a frying pan and swinging it around while there are also feats and even a style chain that lets you wield any magical item as an enchanted improvised weapon while also treating them as many steps larger and giving them special weapon qualities.
Always wanted to do a Samurai skilled at the art of the blade and the fist? Pick this book up and become a true master of weaving the two together in a concert of two-weapon fighting destruction.
A new style feat chain allows you to take the simplest of weapons, a stick, and turn it into a deadly and versatile weapon, especially when fighting defensively.
New options also exist for people that just like to roll attack and damage rolls in the form of combination feats. Hitting someone with a piercing weapon? Lower their SR or resistances for each hit. Hitting someone with a blunt weapon? Lower their DR for each hit. Not quite as exciting as the options for maneuvers, but it does allow for some interesting riders on basic attacks.
When they said there were new Qinggong ki powers, they were not kidding. The number of options for Qinggong powers has essentially doubled with this book!
Anyone remember the Chakra system? Well Luis Loza does and boy did he rework the concept to be way more useful. Instead of opening your own chakras, how about you close your opponents and give them some extremely brutal penalties because of it. From removing a creatures flying speed to negating all healing for 1min, to finally making it roll 2d20 for all rolls and take the lowest.
Want your kinetic fist or elemental ascetic kineticist to go PLUS ULTRA!? Pick up Gather Might to buff all your physical ability scores instead of reducing burn cost. Take some new infusions to learn a style strike or some other various House of Perfection influenced abilities.
You might have noticed that this is, as far as I know, the first Paizo book that allows characters other than UnMonks to learn style strikes!
Finally, Unarmed characters have a new alternative to the Amulet of Mighty Fists and the Bodywrap of Mighty Strikes that we actually want. Handwraps. Let's be real, this has taken far too long, but I'm glad to finally see these. Basically, these are just brass knuckles that let you use your unarmed strikes damage dice. This is huge, monks before this item were better at using weapons than unarmed strikes because it costed half as much to enchant them even though you had the same number of attacks with either.