As for screen protection, this product is fine. It's a thin hard but flexible plastic that comes with a sticky film on each side. You pull off one film, carefully stick the shield on to the screen, then pull off the remaining film.
I did choose this however, as the title suggests for the anti glare properties, as suggested in the title.
After the shield is in place, the surface becomes a lot more reflective, causing more glare not less. Also, maybe through my own fault, very small air pockets remained.