We used this book for our recent trip to Fuerteventura, and found it very informative - tho, being a small guide and mainly for walking trips don't expect great detail, history etc.etc. that you may get in city guides.
However, for walks and driving tours, it was extremely useful, giving good detailed instructions and some small background details - and locations of petrol stations!
We also used it for a trip to Lanzarote in the car, which worked out very well indeed, taking us to a great many sights and places of interest we may not have found on our own.
This book had been recommended by users on the Fuerteventura forum website, and I can see why. A nice little guide to seeing the sights by car or by foot.