I've been using Zagg screen and body protectors for years now. I first got hooked when they offered the body protector with stock designs or a design the customer created.
I had 6 of them one year because I kept designing them with pictures of the grandchildren, who insist on continuing to grow!
I have Zagg screen protectors on every device we have.
I swear by them. They follow through on their replacement promise, and quick. They offer great support and sales on the phone.
I have sold every phone on eBay for top dollar when I upgrade because the screens are mint.
I knew they worked well from experience, but about a week ago, my husband was bringing my iPhone downstairs because I'd forgotten it, and he was three steps down the stairs when he dropped it. It landed 12 steps later, clattering down each one of them.
I have read about how easy the screens are to shatter, and so I had bought one of their shatter-proof protectors, and sure enough, it did its job. Nothing wrong with the phone or the screen. Or at least nothing that wasn't already wrong before the drop.
***I do not work for, know anyone who works for, or invest in Zagg.***