I also have a liquid nano screen protector, similar to this one.
I applied it in October last year, just when I bought my Note 8.
I did not want to use tempered glass screen protectors because I did not know how the SPen will work.
I use a wallet style flip case when on the go, so I basically do not need any screen protectors,
but I applied this to prevent scratches, both on the front and on the back and sides.
I also applied it because it is so easy to apply, and it fits ANY screen, any phone.
As far as my experience with it:
My screen gets smudged nonetheless. I can see fingerprint strokes and swipes when the screen is off.
There is no glare protection, none that I can see anyway.
There is decent liquid protection though: any water or liquid will just slide off, probably
because of the nano film.
It has been almost 6 months since I applied it, and the instructions said that
the film naturally wears off in 10-12 months, so it should be reapplied before that.
I am mostly satisfied, it's just those damn fingerprints....