The point that everyone has to remember, MB would never sell manuals to the public unless they were forced to by the govenment. That is exactly what happend, I have had service manuals from most major US manufacturers, they all were very complete and comprehensive. MB also made similar manuals available and I have had them for 123, 126, and some limited 140 info.
The DVD seems to be a compilation of intro to service manuals, owners manuals, service bulletins, and some workshop manual info including wiring diagrams. The seem to have sanned in some manuals that were available and others that were not. The DVD is good, but not as good as the old as the old workshop manuals. I have not seen the 210 or other DVDs maybe they are better, but I have seen some of the material MB dealers have to work with which remain the property of MB, and it seems that most of the training goes to the mechanics and spreads thru the shop.
I paid $150 it a little quirky as to the later ADOBE version, and allowing some content to run on your computer.