Stef,
Every surface of my GT has at least 1 layer of Suntek self healing film. The front section has two. The underside of both doors have 4 layers as do the rear edges of all 4 wheel openings (which get creamed). The low sharp edges in front that can take a 90 degree hit have 3. The aero tunnel behind the front tires goes from 4 to 3 to 2 and a ton of small stones fly through that opening. Arizona is rock city, just awful. My GT has 3000 miles and has been above 160 MPH with zero damage so far. A lot of members have seen my GT at events and you can't tell it's got that much film on it. It looks great.
Trying to fix paint damage on a new GT would be a lot more expensive that some precaution now. At least that's my take on it.
Chip
Thanks for the advice. Better safe then sorry latter trying to deal rock damage.