I'm a huge fan of Marian's work, and her main stage talk at the 2007 Denver AIGA National Conference was spellbinding and moving—the best of the weekend. As to be expected, her book is beautifully crafted and if you're looking for a keeper of a book object, this might be the pick of the year.
Ultimately, though, I found the actual content to be boring and dry. Much of it was familiar from discussions and other readings I encountered in both design and architecture school, so I can't criticize her for wanting to educate those illiterate to such knowledge. But what made Bantjes' AIGA talk so compelling was how she infused it with the intimacy of personal reflection. Some of that is here, but it's as if the seriousness of the book format compelled her to justify her decorative work more academically, which, alas, doesn't leave room for her to flourish as a storyteller. "I Wonder" is certainly more than can be expected from a design monograph, but beyond it's lavish packaging, it just didn't interest the reader in me as much I as had hoped.