For the life of me I can't figure out why any sane person would prefer repair manuals on CD as opposed to the old hardcopy version of service manuals. Maybe its just the way the Mercedes set up the info on their application but as far as I'm concerned the CD repair manuals are an absolute joke. I've actually ended up buying a couple of the hardcopy manuals that I already have on CD because I so dislike using the CD application.
I think its a classic case of somebody thinking that having a computer involved in any process automatically makes it better than an old process that did not involve a computer. It certainly is easier to store/update and distribute service information electronically but it sure as heck is easier to use a hardcopy manual.
Ever try to follow a circut diagram in the ETM contained on the CD? Good luck.