Let me know how that goes. I have OCD if the screen gets scratched lol. Don't mind so much about the phone body. Well I do but not so much
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I have used some films. Apart from the pain in getting them on ...no bubbles or dust under them they are okay. But they Don't give the natural feel of the screen
I have never used a for my 4s (or 4) and I don't have a single scratch on it. As long as you don't put it in the same place as your keys and stuff like that it will be fine. I don't baby my screen -- just use a little bit of common sense.