I am switching over from MS Office to Open Office 3. I have a number of years experience with heavy duty office suites including Corel Perfect Office and Microsoft Office. And, I can say without reservation that Open Office 3 is an excellent package. This manual comes with the suite's download in Adobe Acrobat format. So, you may wonder why someone would pay for a printed version. The answer is simple, "convenience". It's easier to use a printed version than to keep jumping back and forth, and when you consider time and printing materials, certainly cheaper than printing it off for yourself. Do I recommend it? In a word, "yes".
My only knock on the book is that it is skimpy. The writers try to cover an awful lot of material and in so doing, they don't go into a huge amount of detail on any one thing. That means that they make assumptions about how much a reader already knows. For an experienced user, the book can be quite helpful, for a beginner just starting out on office suites, probably less so.
One problem the book doesn't address is the variation in terminology from suite to suite. For example in MS Office reader remarks are called "comments" whereas in Open Office, they are called "notes". Not knowing what something is called can make it hard to look up. Still, with the manual and some experimentation you should be up and running fairly quickly.