This is a great expansion on Gygax's AD&D. I love the additions of the mystic and mountebank specifically and incorporated them into my game.
My only real gripes are:
1) lack of a gutter for printing the pdf. A hole punch hits text. so unless you plan to stick it in a binder with plastic sheet protectors (big and bulky), you're kind of stuck with holes or using it only on your computer.
2) saving throw information being buried in the spell description. Not sure why the author didn't include it with the other data information at the start.
All in all a great product that has helped enhance my game.
[4 of 5 Stars!]