The overall concept seems pretty cool and it has one positive review so far (I could not find any others). So, it seems like a good buy, but more information is always a good thing.
Here's the thing: I won't be using D&D 4e to run it. I'll be running it with Eden Studios Dungeons & Zombies, so I'm mostly interested in the setting details and will either be converting or skipping the system bits.
So, in that context, is this book worth the investment?