I absolutely adore this source book! It offers a fun addition to any D20 system by giving you the option to add some really great quirks to your character. Said quirks not only make your character more interesting, they can also make playing your character more challenging! Just imagine playing a DnD Fighter who's Allergic to Magic or a Star Wars Jedi who's a Bot Hater. The Jester Dragon's Guide to Defects even includes some excellent metagame defects like Curses Fate or Existentially Ignorant which will affect the player instead of the character!
Regardless of what type of D20 game you're playing, you'll find many defects within this book that you can use. It spans literally all of the game genres available. On top of having all of these great quirks to choose from, the book is also wonderfully illustrated. The comical depictions of many of the defects will keep you highly amused as you read through this fantastic guide!
If you're looking for a way to add some more laughs to your game, the Jester Dragon's Guide to Defects is the way to go!