In reply to petegunn:
I've got a few JW guides and quite like them but that is a bit dubious IMO.
It's listing the actual surface of indoor walls but nowhere does it mention the date of publication and therefore the usefulness of the info it contains.
Obviously if they list it as 9 years old it may impact sales, but then perhaps the secret is to publish books that can be kept current more easily.
As the OP is asking about sport climbing it's even more important.