I don't know. You'd be better off asking that in the DBP forum. I guess like most of these things, you still need to learn a bit to apply it, but it saves you reinventing the wheel. $40 doesn't really sound like that much, especially if you consider the time it will save you. Personally i like figuring out how to do AI and that myself for the fun of it, but if you're more concerned with finishing your game then just pay the money. There might be free AI plugins available though.

You'll be able to click on this someday.