I disagree with the grandparent. I read the book a while ago having already read most of the Sequences -- I think that the book gives a fairly good overview of heuristics and biases but doesn't do as good of a job in turning the information into helpful intuitions. I think that the Sequences cover most (but not quite all) of what's covered in the book, while the reverse is not true.

Lukeprog reviewed the book here: his estimate is that it contains about 30% of the Core Sequences.