I feel the information provided is not really worth much. The stuff in the Workbooks is more or less just what is already in the rulebook, blown out of proportion for every class and every level. The monster books are just a much too short description of the monster (some would be interesting of they provided more information) ... and then some monster variants created for the author's home campaign? There is not really much information about the monsters in general. I really did not get much out of all those books.

For me the Character Workbooks were a complete waste of time and money. All they were is just a set of reminders for each class just repeating what is already listed for each class in the core book as well as the sources for each class (e. add HP, add feat at levels 3,6,9, etc., remember to add favored class bonus etc.). I had expected something like discussions of the merits of various class abilities, pros and cons of choosing various feats etc. They basically took the info from the various tables and put them in blocks of texts. The Monster books were just minor variants from the author's home campaign. I don't care what they are like in your home campaign. I already have hundreds of monsters so I would not spend a cent for variants.

For me the items of this collection are worthless. Really, I want my money back.