The reason they put three inside the box is probably because they hope at least one will stick fine. At first everything looks great, packaging, instructions, even little cloths inside. But when I tried to apply one, every thime i took off the first layer and tried to stick the protector to the iPad, there were little particles sticked to it already which formed little bubbles. And when you try to remove the particle you just put your fingertips all over it and make it worse. I tried all three, same situation with every single one. The iPad was completely clean and polished and there's no way the particles would stick to it from the air or something. You take off the first protective layer and there are particles sticked to the protector already. They are very small, barely seen, but when you stick it to the screen, no matter how carefully, there are always little air bubbles showing up. Eventually I threw away all three and am looking for a proper screen protector which will protect the screen but also look clean.
I don't recommend this product to anyone.