I bought this book in Snowdonia and it is incredibly useful. The day I bought it I did Tryfan's North Ridge and Bristly Ridge afterwards on Glyder Fach. These detailed descriptions/diagrams were so helpful and I always have it in my pocket for every trip. Along with a map and compass, this will give you that extra feeling of security on new routes. Minor criticisms are that the rock climbing grade only goes up to V.diff, thereby JUST missing out on showing you the greatest mountain climb in Snowdonia, Grooved Arete on The East Face of Tryfan (graded Hard V Diff) which is essential for any up and coming rock climber. But then again, I guess they rate V. Diff as the last "easy" grade, and they are probably right. Excellent diagrams and descriptions, and more interesting and varied than "Scrambles in Snowdonia", though that is the ultimate "Scramble only" guide.