I used it my old VR6 engines and back in the day, it was popular with 1.8T engines to slow down oil pump chain wear. It was good in those engines although you can't really 'feel' the difference to be honest.
It might be useful in TFSI engines to slow down HPFP follower wear, but I haven't used it personally. I just use a good oil
Most of the TFSI's running issues can be attributed to worn/partially clogged injectors. We have recently found a good LiquiMoly product that helps with that, which is their 'Injection Cleaner'. It's worked wonders on my clogged injectors