This is a great reference book for the quilter, especially if you like to design your own quilts. I wouldn't be without it. You may have made a number of the blocks in the book, but the directions give you all the cutting measurements for all different sizes of each block, from 4" squares all the way up to 12", 13" or 14" squares, and I find this so helpful when I am trying to fashion my own quilt design. Sure beats having to do all that math myself!
My only problem with the instructions is that they are basic cutting and piecing instructions and do not incorporate the "short cut" techniques that have been developed over the years for making half-square triangles, flying geese, and the like. I am an experienced quilter, so I can substitute those short cuts when I recognize they can be used - and they certainly making piecing easier - but someone newer to quilting would not be able to do this.
Judy's book deals with the blocks only. Unlike Marsha McCloskey's "Block Party"(which gives instructions for 120 different blocks but only the 9" square size),
she does not go on to give suggestions and instructions on how to put a block together to form several different designs or how to put different blocks together to form designs. I have both books and use them interchangeably. This really works great for me. If you can have yards and yards of fabric in your stash, you certainly can have two "block" books, and I recommend it.