This is a fun catch all supplement. Yeah, it has fumbles and crits specific for specific classes, monsters, etc., but also has treasures, traps, and hazards. I like the specific types of crits and fumbles. It adds a significant amount of flavor backed up by mechanics to your battles. Of course, you may not want to use these EVERY time or else your players may live or die by the extremes, but I do like throwing them in for dramatic effect as suggested by the book. This is a lot of book for $9 and I assure you, it's worth the money as it is dense with crunch and fluff.
[5 of 5 Stars!]