As a frequent user of their Deutschland-Spezial, I bought an old one in B & W (1992) to see how they handled US stamps.
With typical Teutonic efficiency, I found the summary tables (e.g. W/F series) and diagrams are very useful. The level of detail seemed to rival the US Scott Specialized.
IMHO, If it ever came out in English, they could give Scott a run for their money!
Dan
