Seems legit, but I don't know if it is eligible for the RossTech software updates which happen several times a year.
I doubt you can be a registered RossTech user for their free technical support. The support alone has been worth the extra $100.
I had an error code on the steering angle sensor that required both calibration and module recoding to be able to use launch control on my supercharged Q5 3.0. This loss of launch control and the related soft code happened shortly after I was out of warranty. This issue required research by RossTech tech staff and personal direct recoding instructions. Just changing a single digit in the code fixed the problem. The dealer wanted to charge me $600 for a new module, plus labor to install it. With RossTech VCDS and their tech support, the fix cost nothing.
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