Biggest problem is that the illustrations aren't that easy to follow; I've seen much better ones elsewhere. In order to compress the tying to something that will fit on this size card, sometimes what would normally be several steps are compressed into a single drawing, making following difficult, especially in low-light or high-stress situations. Saw it recommended on a web site and bought it without looking as closely as I should have. Convenient size, seems well-constructed, but the rivet holding the pages together almost (not quite) covers up some of the text. Doesn't describe uses of the various knots consistently.