No worries at all! It's very comparable to Zagg HD. I did notice some degradation in visibility with my Oakley polarized sunglasses, but nothing substantial that would deter me from recommending the Spigen.
I never got the notch'd version for this or my XS, so no experience with those, sorry. There is no change using FaceID or any of the other sensors ( TT, NightShade etc .. ) post Spigen.
I'd give it a go, especially for the price and the option to always return if it falls short of your expectation.