A mate of mine had the survival guide (I still eye up buildings with stairs as possible places to hide) but extracts have not convinced me that WWZ would be enjoyable. Brooks just seems to take the fun out of it all with the drawn out explanation of how the zombies came about and how they ended up over running civilisation.
For me, part of the fun is that our heroes in most of these types of shows/films simply wake up and find the zombies everywhere. Much like a force of nature, they're simply there for us to recoil in horror at. Going into the wheres and whys just takes away from that for me.