Some people would write off these accessories as "trivial",that's what I used to think. I never really thought there would be any need for a scratch protector. But then I decided to get one for myself, I chose InvisibleShield. I was concerned about the air bubbles, but another frustrating thing was getting the protective layer to actually align with my iPad and look neat around the side. It was so off mark on my ipad.
If they're going to make these protective scratch layers, they need to make them compatible with the device they are being used for, otherwise there is no point of using it. That is one problem with InvisibleShield, I also got one for my phone, and it didn't seem to fit well on my phone with overlapping areas, and sides that just came up too short, and it was made for my phone's model. I didn't think I will have that much trouble with these accessories, but now I've seen that many of them are no more than trivial "extras".
Not only are some of them rubbish in trying to install, but also unworkable in application. The so-called scratch proofing of InvisibleShield is just unrealistic, as I didn't see a single advantageous trait in its film layer. All in all, it's nothing more than a trivial "extra", which should not be taken seriously as some kind of enhancement.
On a lighter note, some scratch protectors are decent enhancements, like Gagdetshieldz, which really provided protection to my iPad, and allowed for a sustainable, unblemished look, free from marks. That's the difference between an "extra" and an enhancement.
