The protection is not entirely neutral and invisible on the screen but the change is very discreet when même.Pas yet tested in full sun; Apparently, this protection significantly reduces reflections.
The fingers glide very well on it (better than directly on the screen). The screen sensitivity is not affected by this protection.
Protection also can greatly reduce the fingerprints; fingers much less marked than directly above the screen.
A little extra: The choice of black or white border color protection can give the impression of having changed color ipad, although the rendering of the color change is not perfect (we still see the original color around the camera and the right button).
Only downside: the price !! But already with a small "pop" on my screen, I find it very useful.