Stanley Gibbons Catalogues

I'm thinking of buy a set of their Single Country and Foreign Catalogues. I've been told they have a more through listing of stamps as compared to Scott. Especially when it comes to the Middle East. I will start buying them as they come out so this will probably be a 5 year or more process. The Part 9 for Portugal & Spain, Part 17 China, and the Eastern Pacific, St. Helena, Ascension & Tristan Du Cunha catalogues all have publishing dates of 2011. Does anyone know if these catalogues have stamps listed through Dec 2010? Would it be best to wait until catalogues published in 2012 are released?