I've used multiple Griffin products in the past and had good experiences with their cases, but this is the first screen protector I've used. It's a beautifully made sheet of glass and I don't doubt the claims on the box in terms of hardness and quality. It was easy to attach, coming with a great frame to help you line up the phone with minimal effort.
The problem lies in the reactivity of the touchscreen after application. Griffin boasts of a seamless touchscreen experience with this protector, but what I've found now after half a day is that the screen has lost most of its responsiveness. I believe the application of the protector was textbook - everything was dry and clean, perfect line up, perfect adhesion - but the toughness of the material just renders the touchscreen only 50% usable. Typing a simple, short text message is now an arduous ordeal, and just accessing different apps requires quite a firm push on the screen. This effectively negates a lot of the extra processing power and speed of the S9+, which on its own has so far been a completely responsive and lag-free experience.
I don't doubt the defensive capabilities of the product, but it's a hard sell for $50 when the phone is essentially neutered upon application - the meaningful use one would get out of this phone with the glass attached wouldn't even warrant that extra protection in the first place. I will be removing this screen protector and trying another brand.