I use it and like it. Additional vehicles are only $15 or so. DIY is car by car. The pro version is the full website (and financial tools such as invoicing and inventory). The DIY should be the same as the pro, just limited to the cars you sign up for. Also, it has TSBs, which the MB manuals do not have. I was able to diagnose my rear window hot short problem using the TSB for this area.

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David
1986 300E Anthracite + ECodes + MB Mileage Award