This is a remarkable book and nobody can really contemplate walking this route without it. The book is durable, concise and mostly accurately written. Be sure to buy the current (second) edition though! The route there is different, and better.
I have given it four stars, because it is not perfect:
- it has either been written or edited down to the absolute minimum number of words possible, and in some places the clarity suffers. Directions frequently omit useful phrases such as for example: "10 km further on" thus leaving you with the erroneous idea you are to turn left and then immediately, or soon, right..
- like all Cicerone books it is quite heavy for its size at 415g.
- it has at least one *extremely dangerous* bit on p78 where you are told to leave the ridge leading to pic d'orhy on your left whereas you *must* leave it on your right, ie descend to the left side of the ridge. The right side is impassable. There is a plaque there to a walker who fell and died, hopefully not clutching a copy of this guide.. I wrote and told cicerone but got no acknowledgment.
- I found Joosten slightly intimidating in that he is evidently superbly fit, can walk fast all day and uses adjectives like "interesting" where I would use "challenging," and "challenging" where I would write "bloody dangerous" - so I never went on those parts of the route he describes as "dangerous!"
Otherwise though this book is really good and as I say, pretty much indispensible. If your French is good, buy Veron's guide as well, and compare the two before you go. Mine is not quite that good!