After having tried various instruments throughout years (with and without teachers), I can tell this book is one of the best methods available. Each theory part is broken down to simple exercises and along learning bass techniques, you are learning the basic music notation theory. Each day, you can learn something new, and you never get bored, as you can see actual progress.
Another great thing is how the tracks are split on the CD. Some of you might find it trivial, but when a whole chapter is put on one single track, it becomes frustrating to have to fast-forward it to repeat an exercise. But this is not the case here, as each exercise is on a different track.
If you choose to buy this book, let me give you an advice: from the first pages, play every exercise with a metronome. It will train you to count and to keep the beat steady. As you will gain some experience with timing, try to turn off the metronome and count on your own.