I saw a review by Paolo Parente saying it was very good (I think it was on the Dust FB page) and tried to buy it, but like you said, it's very expensive. And I think that the contents are an expansion of the articles posted in the Trucks & Tanks N°11 magazine and in the Ligne de Front Hors série N°12 (which are way easier to find and buy..and even get as a scan).