I've used this toolkit both as a GM and as a player to help build characters with disabilities - and it's been an invaluable resource to make those characters feel capable and real, and to show the world through their eyes.
I have not seen any other RPG publisher put much thought and care into giving disabled writers, players and characters a place at their table. And after reading this book I've become aware of how restricting that has felt.
What this book represents should be the industry norm. But until we get there, this will continue to be the most prized book in my RPG collection.