Bottom Line - Cool for kids, but not a definitve guide for obsessed fanboys.
I'm an adult collector. I was hoping this book would be a cheap alternative to the Art of Iron Man 3 book, and have pictures and info about the suits of armor not seen in Iron Man 1, 2, and Avengers, and the majority of Iron Man 3 (Marks 1 -7, & 42). 42 - 8 = 34, so I was expecting to see 34 different suits of armor. I didn't count, but I think it was only about 8 or 10 new suits in this book, with a bunch of pages about the Mark 42 and Tony's mindset around the film. Still cool to see, especially some of the concept designs from previous movies and some of the Hasbro toy repaints made into models for this movie.