Well, I finally broke out my "Model 123 Service Manual Library" (Version 2.0, P/N P-2700-123-098) from MB to do some electrical system diagnosing and am disappointed by the low quality of the scans. A noticeable portion of the text is difficult to read, the contrast is poor, page edges are cut off, many pictures are nearly worthless, and some of the wiring diagrams are downright illegible (see <CD Drive>:\program\Climate\83-600a.pdf, especially pages 10 & 11 for a particularly egregious case). The navigation scheme isn't too hot either, but I've at least been able to find certain things by searching files individually (I'm still looking for the HVAC component location list on page 301, though). I suppose it's better than nothing, but MB should be ashamed of the poor quality.