The Missing Link
If you are studying for the 7 and don't get all the concepts then this book will fill in the blanks. Great, like all the "For Dummies" books.

Series 7 timeline
I just passed my Series 7 exam a few days ago, and it sure does feel good to have that behind me! I'll try and provide an accurate time line along with any details I can remember:

I started studying in late June. I bought this Dummies book, Pass the 7, and attended a Kaplan week-long class 10 days before the test. I think the Dummies book is a good start, but definitely not the end! I would recommend starting with that book because it is an easy read (I read it in two days!) Then I read the Pass the 7 book, which is a little deeper and much longer. These two books together work great!

I then took the Kaplan course which helped me a bit more. I think I was definitely the most prepared coming into and going out of the class.
Probably the BEST thing I got was a Kaplan CD FULL of questions. I probably took 15-20, 125 question tests in 10 days. This is what sealed the deal for me.

I was getting anywhere between 72-76% consistently, which left me a little worried because most people say you should be getting 80-85%.

Then came test day: I did very, very light studying on test day. I figured I wouldn't learn anything in the last hour I hadn't been able to figure out in the last 6-8 weeks. I got into the test and finished the first half at about my normal practice test speed: 50 minutes. I took the required 30 minute break plus a small 5 minute break right before that (oops!) I got back into the test after the break and continued at my usual pace. I felt pretty calm the entire time. Until the final button had to be pressed: Are you sure you are finished? 'Yes.'

I had put in earplugs because the girl next to me was taking the GMAT, I think, which requires typing. My heart was racing. You know when a cop pulls up behind and turns on the lights to pull you over? This was at least twice as intense waiting for the score!

Well, it turns out I got an 86%! Wow! I was so surprised!

Not comprehensive
The book is well-written and is nicely edited, but it does not have all the information that you need for the test. The author is nice enough to list all the things that you SHOULD know, but does not cover all them.

This book should be used as supplementary only. The practice tests are useful, but I would advise you not to spend time reading the content, as you are guaranteed to have to read another book in addition.

A review from someone who actually TOOK the test
Excellent book that won't put you to sleep when you're trying to read 700 pages from Kaplan. Keeps it easy and to the point, great reference to go along with other materials.

And, yes, I actually took the test, and passed. Using this book.

Everyone knows you can learn a lot from the dummies series.
To pass the test: Bonds, Regulations, Accounts, and a few minor others, but definitely in that series. But ultimately a series of questions, a pocket of information.