Works fine from what I understand but they are in no way affiliated with Ross-tech and from what I understand illegally bypass the VCDS licencing by emulating the genuine ross-tech cables.
This is what ross-tech have had to say about these cables in the past:
Each of our genuine interfaces contains a proprietary firmware and serial number/activation, VCDS will not work with 3rd party hardware. So if somebody offers a product which they claim is "similar", they would need to illegally copy/clone our firmware and serial number/activation.
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