I have the book and worked over halfway through it by now.
I must say I have never seen a book on endgames so well explained.
De la Villa tries to give "rules" for as far this is possible, many endgames I do understand much easier than before.
Its easy to forget for example after a year or so how a certain rook endgame has to be saved or won, but by these explanations it feels like it is easy to understand.
I think IM John Cox would have said anything else if he had done a bit more than only looking by it quickly in a store and understand why exactly that engame was given.
(Anyway I like most of John's books too
)
I rate this book very high and I think it's a "must buy!".
I have the endgames dvd's by Karsten Müller which I found very good but this book makes it even more clearer.
I once was rated 2300+, now its about 2100 because I didn't play much but I think it's good material for 18/1900 up to even 24/2500.
You can study a lot of openings which can become "outdated" but these important endings de la Villa discusses certainly don't!