These screen protectors work fine, although they do not stick to the screen nearly as well as the more expensive "brand name" ones. It's fine for my use as my phone case helps keep the screen protectors on.
It was cheap so I wasn't expecting much. The protectors aren't sticky enough and will randomly come off if you pick at them. You definitely need to put a case on your phone if you are using the protector. But it was very cheap so you might as well.