I'll be in the minority but I didn't like the Zagg shield. Look at the feedback on Amazon and you'll see I have lots of company. Installing it was horrendous but even after that trying to write with it on my device was challenging because of how rubbery it felt. Smudges showed up in greater quantity than with nothing at all.
Right now I have a protector that came with a case I bought on Amazon. Something from China. I actually like it. It was much easier to apply and does its job.