In order to highlight the contrast with GGPfB, Baduktopia's approach deserves some attention.
This problem is from EL&D2:
$$B
$$ | . . . . . . . . . . . . .
$$ | . . . . . . . . . . . . .
$$ | . . O . . . . . . . . . .
$$ | . . . . . . . . . . . . .
$$ | . . O , O O O O . O . . .
$$ | . . O X . X X . O . . . .
$$ | . . O X . . . X X O O . .
$$ | . . . . . . . . . . . . .
$$ +--------------------------
- Click Here To Show Diagram Code
[go]$$B
$$ | . . . . . . . . . . . . .
$$ | . . . . . . . . . . . . .
$$ | . . O . . . . . . . . . .
$$ | . . . . . . . . . . . . .
$$ | . . O , O O O O . O . . .
$$ | . . O X . X X . O . . . .
$$ | . . O X . . . X X O O . .
$$ | . . . . . . . . . . . . .
$$ +--------------------------[/go]
This problem appears as the first diagram, it's a bit of a thinker, but for those who don't have the discipline to not look very slightly to the right (or down, in the case of this post), the answer is right there on the same page.
$$B
$$ | . . . . . . . . . . . . .
$$ | . . . . . . . . . . . . .
$$ | . . O . . . . . . . . . .
$$ | . . . . . . . . . . . . .
$$ | . . O , O O O O . O . . .
$$ | . . O X . X X . O . . . .
$$ | . . O X b c . X X O O . .
$$ | . . . a . . 1 . . . . . .
$$ +--------------------------
- Click Here To Show Diagram Code
[go]$$B
$$ | . . . . . . . . . . . . .
$$ | . . . . . . . . . . . . .
$$ | . . O . . . . . . . . . .
$$ | . . . . . . . . . . . . .
$$ | . . O , O O O O . O . . .
$$ | . . O X . X X . O . . . .
$$ | . . O X b c . X X O O . .
$$ | . . . a . . 1 . . . . . .
$$ +--------------------------[/go]
The GGPfB approach would just give

and say "No matter what white tries, black gets two eyes."
In EL&D2, it's given along with several potential white responses, which each get several diagrams dedicated to showing why white might try it, and why it doesn't work. The message is simple: this looks scary, but you can counter this.
$$B
$$ | . . . . . . . . . . . . .
$$ | . . . . . . . . . . . . .
$$ | . . X . . . . . . . . . .
$$ | . . . . . . . . . . . . .
$$ | . . X , X X X X . X . . .
$$ | . . X O . O O . X . . . .
$$ | . . X O . a . O O X X . .
$$ | . . . . . b . . . . . . .
$$ +--------------------------
- Click Here To Show Diagram Code
[go]$$B
$$ | . . . . . . . . . . . . .
$$ | . . . . . . . . . . . . .
$$ | . . X . . . . . . . . . .
$$ | . . . . . . . . . . . . .
$$ | . . X , X X X X . X . . .
$$ | . . X O . O O . X . . . .
$$ | . . X O . a . O O X X . .
$$ | . . . . . b . . . . . . .
$$ +--------------------------[/go]
What's this then? The same problem is shown inverted, with a bunch of diagrams spent on showing what happens if you do it wrong. They even spend a diagram on a wrong response to the wrong response. I'm hoping for a wrongception in the later two books.
So that's one single problem, over three pages, for a total of 18 diagrams. Most problems aren't shown that elaborately, but it's quite common to have three diagrams about the same problem. It feels a little unwieldy and I often catch myself thinking "yes, yes, that was obvious".
What if it's not that obvious, though? After reading out the first diagram, you'll see nothing new in the other 17 diagrams, but if your reading failed due to a blind spot, or you simply don't understand why your different answer fails, it can be helpful to see the result.
This sort of demonstration isn't aimed at people who can just read it out perfectly, but it is aimed at people who want to learn how. It's showing plainly what you "ought" to be able to see if you can read it out.
There are almost (I don't know why there are exceptions, but there are a few) no letters or numbers or other markings in the diagrams. Just some stones with a simple instruction written above each diagram, like "kill white" or "save black". The reader is always black. An inverted problem always signifies you switch between killing and saving.
The theme of every page is clearly mentioned on top. It's a very strong hint about what kind of move you should be trying to find. If you're supposed to be looking for a ko, you will be told on a per diagram basis, too.
There are no answers in this book, either. I really don't know what I'd do if I could still not see whether something is correct or not, after all those diagrams. I really treat them as answers. You might want to use a card to cover them when you're going through this book.
The only ones which aren't a case of the blatantly obvious are the little "tests" every once in a while, which refer back to specific pages. There are actual answers available, for the especially hard of learning, or the highly insecure, which you could download off the Baduktopia website.
One other thing which I should really mention, is that a lot of problems have several solutions. The foreword freely admits this, since it's not really a problem as such. If you ignore the pervasive hints, you can find perfectly workable alternatives in many cases.
The goal of this book is more about teaching you specific moves than trying to drill the one sacred correct answer, so that's why the authors haven't contrived their problems in such a way that only one move could work for each of them.
The end result is a far gentler approach to tsumego, which is a little wasted on me. I still appreciate this format, since it adds something completely different which may work very well for some people. I really wonder how much this could have helped me earlier on.
Obviously, it's not actually worthless to me now, either. It just lifts the curtain to things I've already seen with all the extra diagrams. I'm too lazy to extract all the first diagrams (without any solution or hints) into a list when they're already printed in the book.