I have the CD service manuals for the W124 chassis and have spent some time using them..... IMHO the hardcopy manuals are much more useable than the CD ROM versions. The ETM portion of the CD ROM manual is pretty much unuseable at least on my PC - its just way too slow and the font sizes are tough to get just right. Of course (like most every PC product I use) it also seems to "lock-up" at random points....

I don't think I'm the only one that feels this way - I've noticed that hardcopy MB manuals on E-bay seem to be appreciating these days....

I don't have the hardcopy manuals for the W124 chassis so I dont know if the CD rom versions contain different or more data than the hardcopy versions.