I've gotten Magic Lantern Guides for several cameras I've had over the years, and each has proven indispensible. I've had the MLG for the Canon 7D on pre-order since I got the camera, and it was well worth the wait. This one has a new look: color coded chapters and section headings, highlighted commands/functions, sturdy glossy pages, and full color photographs. It includes a pop-out trifold quick reference card that you could carry in a wallet, but frankly my MLG's always go with me in my camera bag. I've been doing SLR photography for 30 years, and have found that there is always some function on my camera that I could do better or differently, and especially with the vastly complex DSLRs, having the MLG in my bag for reference is extremely helpful.
As for the text, I find it extremely well-written and thorough. It follows an outline-discussion format with a fair amount of visual examples. It tells you how to use every feature of the camera clearly and concisely, as well as suggesting settings for specific situations. The 10 pages devoted to white balance settings and features are extremely thorough, covering not only why you want to use white balance settings, what the presets do, and how to make custom settings, but how to make white balance corrections also. While I think this book has a wealth of information for a beginner (disregarding the fact that the 7D is not an entry-level camera), I see it more as an invaluable tool to make learning, and becoming more comfortable with a very high-end camera, easier for an intermediate to advanced-amateur photographer. The way it is laid out, it is also very usable as a reference guide when you want to look up specific topics also.
Incidently, I looked at the 7D Digital Field Guide by Lowrie at a bookstore while I was waiting for my Magic Lantern Guide to be shipped, and I am glad that I was patient. The Digital Field Guide was larger in physical dimensions so it would not fit well in a camera bag, unless you had a large one. It was certainly not as thorough as the Magic Lantern Guide, and really didn't provide much more than the manufacturers' manual that came with the camera. I just did not find any information in the text that made me go "hmmmm...I hadn't thought of that...".
The Magic Lantern Guides Canon EOS 7D will not disappoint you. My only complaints about the book is that I wish they had used a slightly larger font for the text (it is well spaced, just wish it was a tad bigger), and I would have preferred a photograph of something other than a snake at the beginning of the Controls and Functions chapter. I really don't like snakes. I do expect to be using my MLG with my 7D for years to come.