both the S3's are outdated now. The Golf R is the replacement part number for them. The original S3's are hard to find anywhere now, especially a metal tank one. If you do find one, its more expensive also.
I agree on the expensive part. That's why I went with the new golf R version. Was just confused because you said initially that the metal end one was better in your opinion but then said the new plastic end one is better.
In the vid you also mentioned that you did that swap multiple times. Did you ever notice if they part numbers of the stock GTI IC matches up with what ETKA says it should be?
Also have you ever removed the bumper of a vw with front parking sensors installed?