Having had and used the 126 chassis manual for over two decades, I can say that I have yet to find something in the many manuals covered by the CD that wasn't in the CD. Stated otherwise, the CDs include the Engine manuals, Chassis manuals, owners manuals, maintenance manuals, Electrical troubleshooting manuals and climate control manuals for all years and versions. If one wanted one could print all those manuals from the CD and they would be complete with the latest suppliments (which isn't necessarily the case with the printed manuals - the first versions of the chassis manual were only one volume).
If one knows where the info exists the CDs provide everything, if one lets one fingers do the walking then the phone book edition definitely works best.
Bosch Master, ASE Master, L1
33 years MB technician