I bought the first book (before the other two came out) and was very happy with the depth of information in it, except for the lack of explanation on how to do the hollow cubes. I then bought Sara Nephew's book, Big Book of Building Block Quilts, which has instructions for the cubes. (Maxine Rosenthal, author of the OBW books, gives credit to Sara Nephew in the first book.) I haven't purchased the next two OBW books, so I can't speak to how well they compare with the first.