These cube books are in the budget end of the design books section, alot of their stuff seems to be submitted by folk who have alot of promo stuff in on-line portfolio website. This book is a good example. I'd say your better off spending a few more quid and getting the Logo's series book as they are quality and you get alot more for your money.
With this you'll get annoyed by the restrictive nature of the spine of the book and the poorer quality logos your fighting to look at!
Buy this if your on a budget or student or just want to add to your collection of design flick books, but dont hold out on it to really get those creative juices flowing!