Genuine VagTacho is probably the most reasonably priced tool available for Vag cars and the original is flawless.
I have the real VagTacho and haven;'t found that to be the case. The VW support is pretty good, Audi is Dicey at best. Don't plan on doing an Allroad, and many other Audis.
I shelled out the cash. And it has helped me a fair amount, but there's a lot of lacking coverage that it should work for, and I don't know why.
My locksmith friend has had the same experience