Well, I bought both: Me 109 and FW 190 (2 DVD´s each). Don´t expect enough stuff as needed to build your own bird. It is rather a mix of factory blueprints, mainly cross sections, redrawing of the same blueprints in several formats: .dwg, .pdf. etc., most of the manuals available in the web, factory blueprints of small parts that I not always can recognize.
It is a good acquisition for a collector, but not essential for a good modeller. It is my humble opinion based in the fact that each aircraft is not entirely represented in the DVD´s, just part of them.