I wish I could give this product 4.5 stars, as there's some typos and one or two balance issues. But overall, this is really, really good. What I really appreciate about this book is how candid it is. The author isn't out to create a setting book or get you absorbed in a world. This stuff is meant to be used how you like and the frank approaching to explaining engenders me to figuring it out and pulling over it. The extra rules for making monsters more interesting is of particular use to me, as they're fast and interesting. It's remarkable to me how the simple suggestion of letting a monster regenerate and it being stopped by something other than fire, for a flavorful reason, hadn't crossed my mind before, but this book not only suggests it, but gives a SUPER useful chart to making it work for each CR.

Also, the suggestions for tunning games is just great. The idea for running elemental weapons is superb, and I'll be making use of that. Thanks, ForeverGM, from another forever GM.

There is a lot of free stuff in this box: class options, spells, monsters and variant rules. It's most suited to those who like trying out other's homebrew options or for sparking ideas.

The big issue with the character and weapon options (and the spells, to an extent) is power creep. If you were using these options you'd need to serverely ramp up the difficulty of your adventures to avoid them beign an absolute cakewalk.