I've almost finished my third DJ. I know there are a lot of people who only use the book, but I have a feeling I wouldn't have finished my first DJ if I'd had to trace the blocks and figure out the placement of the pieces for paperpiecing or other ways of putting together those tiny little pieces of fabric. The software and the "that quilt" website helped me make almost every block. Another bonus of the software for me was that after using it for several months, I purchased EQ 7 and it was so much easier to learn. The DJ software was sort of like training wheels.