When I first got my I Phone I was constantly paranoid that I would drop it and the screen would get cracked or that I would put it into my pocket with my keys and it would come out covered with scratches. So I brought this ! The Belkin Mattescreen Overlay!
Basically , It protects the screen from scratches and chips. It is a thin plastic cover with one side which is adhesive so it sticks very firmly to the screen. One of the massive down sides is that if it is slightly off place when you place it down , it is very hard to change it and then you will have to pull it up and get a new one because the adhesive will be worn out. This happened to me when I first got mine. Dust and air bubble can also get stuck underneath and this can mean that you have to get a new screen protector.
The screen protector has a matt look unlike the original screen which is shiny. It also make the screens excellent touch screen slightly un responsive which can be very annoying ! Whilst using the key board with the screen protector , it can sometimes make you click the wrong letter because of tiny pieces of dust underneath affecting it which is incredibly annoying when trying to write a text or email ! It also reflects the light which can be irritating and can even hurt your eyes !
Overall I would suggest just leaving the screen how it is ! If it is going to get scratches , it is going to get scratches ! I would much rather get a scratch here and there than and be able to use my phone the way it was meant to than not have any scratches but not be able to type !