I have used
Manhattan GMAT Guide with all of its 9 books. I have to say, that the first book which was titled Number Properties has proved the most useful. In the beginning, I had very poor knowledge of the subject. This book gave a steep learning curve but the results were worth it. From my personal experience, the book gives good foundations for getting the basics and some advanced knowledge on the subject. Also, it provides with great strategies for solving Data Sufficiency problems. It teaches you how to simplify the questions and come to a more clear question. After these steps, it becomes easier to analyze the given two statements.
In general, I am very satisfied with these books. However, I wouldn't say, that going over only Manhattan GMAM Guide only will prepare you perfectly for the exam. It will prove useful to use other resources such as Bunuel questions on the gmatclub forums.