VCDS is the go-to tool for 90% of what I need to do.
There are some other tools however which can do things which VCDS doesn't such as module parametization, software flashing of modules and ECUs, and VIM.
It depends which additional modules you purchase as to how much it ends up costing, but like with most of these things if you don't have a use for it then probably not worthwhile to have it sitting in a drawer.
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