I have vcds. I have the unlimited vin code pro version. It covers ALL VW group vehicles. We have the CalI and Audi in our family. Lamborgini is also supported.
When I went to Birmingham VW Van Centre last year the technician told me that vcds provides more capability than the official VW diagnostics.
I also have used Ross-Tech technical support when wanting to apply a config change to our Audi. It was not available as a menu option, but it came in the next free upgrade.
VCDS is not just for the minor tweaks to config. It also allows you to perform VW garage 'adaptions'. i.e a DSG gearbox reset. The Ross-Tech forum provides loads of how to guides.
Yes fairly expensive, but pays for itself.
Let me know if you want any more info.