This new guidebook is the best single guidebook for any DC based climber - Horst covers all of the major area's within range of Basecamp (Seneca, the New, Great Falls) and some of the other areas which currently don't have good guidebooks(chief among them Old Rag). While the individual guidebooks for the major areas are certainly much better(neither Seneca, and especially the New don't condense themselves well) - if your passing through the DC area, or getting a feel for the DC climbing scene, this book will point you in the right directions, and save you both space and money. Just buy it at a local store.