Well forevermore. Another thing to spend time on that could be either a handy tool or another thing to store. I've never heard of a stitch book but can see the usefulness of seeing all those stitches in all their varieties. However, I always test out length and width when deciding even on a zigzag stitch before using it at the time of sewing. I can see myself spending a lot of time sewing up samples of stitches I would never use.
But, I do like this idea......