No, I've not tried to save the same finger more than once.
I've just tried, each finger until it passes then move on. In 10 presses I got 6 passes and 4 fails and that felt like better than usual... There are times it just stops me trying any more and I have to use the password, like some kind of neanderthal!!!
Can I ask, those saying it works 9 out of 10 or better, are you testing this without it detecting your face? Face it off to the side and unlock with your finger to check it's not using your face.
How does it use AI to improve? It would actually be quite good if it could see it's your face, but doesn't recognise the finger, but it adds the print to its database so to speak...
On another note, just installed my XtremeSkin -