I was disappointed by the sparsity of information in this book. I'd hardly even call it a "guidebook." More of a "character guide." Even that is only a few paragraphs per character. Hardly anything substantive. And the storyline isn't, basically, covered at all. It's certainly nothing approximating the encyclopedic book I'd hoped for. Was really hoping for a recap of the storyline and maybe some additional information or backstory. Sadly, nothing... Just short bios of the characters, unfortunately.
This is pretty skippable. As is the Energon Offical Guidebook. Neither one was particularly interesting or useful. I'm kind of glad they never made an equivalent for Transformers: Cybertron, so I didn't have to waste my money on that either.