This was a very interesting and fun addition to my D&D game. It contains quite a bit of differnet character options, good solid ideas for how to run the game and otherwise just has some really intriguing ideas to it.
Now, it is a rather costly product, 20$ being perhaps more than some people are prepared to pay for a D&D supplement. And I will not presumeto say if it is worth it or not, that depends on a lot of personal viewpoints etc.
What I will say is that I personally enjoy this supplement and think that its additions are welcomed and fun, I especially liked the idea of having a barbarian caster (even if I'd never play a barbarian) I enjoyed the fact that it was an option.There is also a dead background and a slew of other interesting things.
Now, that said, the character options and other items in the book aren't perhaps as extensively playtested and balanced as the materials that Wizards of the Coast produces, which is quite understandable. It is however quite good and in my optinion not that difficult to slightly alter it to perhaps be more balanced or to fit into your game.
All in all, I thoroughly enjoy the items and options that this complement brings, but can you live without it? Yes, I think one can, unless you're particularly enamoured by at least a few of the options in the book, prehaps it isn't for you. Simply because of its price being what it is, you should at least feel like the options provided on the items page are interested.
A good item, I enjoy it, just make sure that you check the headlines of what's in it and feel at least a little interested by a few of the things before aquiring.
[4 of 5 Stars!]