I had a full nose bra on my previous car (I put 140k on it) and when sold it had no more than maybe 3 chips in the hood but they were probably from rocks that came down at a sharper angle after being kicked up by a car/truck in front of me. So far in the 14k that I've had the car (with a full bra on since about the first 1,000 miles) there are no chips in the hood. I do see a hole in the bra which prevented the hood from being chipped (the bra has a hole in the top leather section but it does not go through the white cotton lining and the hood is fine).
As with my last car - once the bra goes on it rarely comes off of the car. I don't really care what the hood/bumper looks like after 5 years of being under the bra as it is there to prevent most chips from occurring in the first place. The full bra also saves the bumper from those <2
mph parking lot bumps while a clear bra is usually only on the hood and doesn't cover the front bumper.