RUS is a reference tool, just like the database. Most of us who like and "rely on" the book also are well aware that most of the songs in the book have multiple versions. I've been at many a campfire where no books were used at all and you still have the problem of people trying to sing different versions of the same song all at once because everyone "knows it". I myself will look forward to the new edition - I'm sure I'll add it to my collection.