Nothing can stop them for good......if a whacking great rock pings up at the bumper then its going to mark it....small chips it should stop though - just make sure the film doesn't get scratched or it'll look a right bollox.
I've asked Taras at RT-Performance about having this film put on the front end of my zed, after all he has just resprayed the whole car for me so i dont want to get stone chips as soon as i leave the spray shop. Taras emailed me some information about the Hexis wrap, and it protects against stone chips, small scratches, vandalism, 3-4 years durability. You can also still clean and polish your car in the same way as you normally would.
Im just waiting on a price from Taras, but this is something im seriously considering having done.