UPDATE - Maybe Good News !!
Ok I have only had this thing for the afternoon. Did a quick test and posted my results. Went out and have had a another go.
1) All my tons of apps have updated now and the touch sensitivity seems to be spot on. Maybe it was just bogged down from downloading tons of pictures, apps all at the same time on first launch. Only had 5minutes testing before this post but so far feels buttery smooth and responsive like my 10.5 inch ipad Pro.
2) The face ID still didn't work. However, JetTech sent an email saying to push down on the screen protector right where the face ID is. I didn't do this before because it looks like a perfect seal no bubbles or anything. However, I thought worth a shot so took a micro fibre cloth and pushed that part down. Bingo, suddenly Face ID works fine. Again don't know the longevity of this but it seems that a tiny imperceptible amount of gap can throw FaceID off. So maybe thats why some had face ID work initially then fail as the screen protector came unstuck by some invisible tiny fraction of a mm that changed its refractive properties.
Hope thats useful info. Very pleased myself. The screen protector went on so perfectly this time that if everything works its probably the first time ever I have had one go on so its totally invisible. If all the features keep working its a total win.
All I need now is a case that actually fits and is compatible with the new Apple pencil (but they offered to replace it within 2 weeks with an accurate case, seems to get them on amazon before launch they make them based off the leaked moulds which aren't quite right
https://www.amazon.co.uk/gp/product/B07H6D621S/ref=oh_aui_detailpage_o01_s00?ie=UTF8&psc=1).
That and for Netflix etc to be updated to go full screen
ps
If you didn't read my earlier post I am using the JetTech screen protector from Amazon.