I have now use this book in 5 different National Parks in southern Spain and have followed almost 20 of Guy's routes. On all of the walks I have found his notes to be clear and precise but, more important, he has chosen some simply BEAUTIFUL walks.
Amongst the highlights of my own walks was 'The Walk of the Thirsty Bear' In the Cazorla Park, 'The Walk of the Forgotten Hamlet' in Aracena and 'The Walk of the Eagle and the Kingfisher' in the Alcornocales Park. What I love about the book is that Guy has chosen mostly circular walks - you don't need to worry about transport back to the beginning of your walk - and includes his favourite places to eat and to stay in each of the Parks. I found a couple of the walks in Cazorla to be quite challenging but they were classified as 'Difficult' and I was walking in mid June when the weather was unusually hot. I have stayed at a number of the places that he recommends, mostly simple B&Bs, and enjoyed them all.
When the weather is cold and dark in England I instinctively reach for my 'bible' and begin to plan my next walking escapade.
And I should say that what makes this guide doubly special is that Guy rewalks the routes for each subsequent edition(I recently picked up a walking guide that had been unchanged in 7 years!).
I also have found Guy's other book 'Small Hotels & Inns of Andalusia' to be another great travelling companion. It lists his favourite places to STAY in Andalusia and, again, is sensitively written and, best of all, you can trust in his recommendations.