I bought this guide for a camping trip around Europe and it was useful although not always accurate and quite difficult to use.
Although the information is there if you spend long enough looking for it, the book is very badly organised. The maps showing the campsite locations are not very accurate and are not easy to use, e.g. they show where the different campsites are but don't tell you where in the book you can find the information about each campsite, or even what section of the book.
The book is structured into regions of each country, which is quite confusing as it's not always obvious which region you want. Some campsites seemed to be in the wrong region, e.g. I found a campsite in the region 'South West France' which was actually further east than a campsite in the 'South East France' section! I came across several examples of incorrect information too.
Overall, this is quite a useful guide and lists a large number of campsites, although not all of them. I'd estimate that for every campsite I found from the book, I drove past another 3 that weren't featured. The information about each campsite is minimal, e.g. a sentence describing it very briefly, and the address information is not always good enough to find the campsite on either a map or using the sat nav. The symbols about each campsite are useful to find information about the campsite's facilities, price etc. It's just frustrating that the authors didn't bother making it easier to use.