I've got the GM bra. I also only use it for long trips. I have not seen any evidence of fading or rubbing of the paint, but I have only used it a few times so far, and I don't use it in the rain.
It is a bit of a chore to put it on the first time, especially since it requires replacing several of the trim plugs in the wheel wells with snap heads. Putting it on the car will require either squatting in an awkward position or sitting/lying down on the ground to reach under the front bumper to place the hooks there, so you may want to keep a towel in the trunk to keep your clothes clean.
I have found that after putting it on and taking it off a few times, it has become a lot easier, and I have gotten pretty good at doing it quickly. The hardest part is the two small triangular pieces which go on the hood, to the outside of the headlights. These are very tight fitting and require a bit of effort to get them inserted between the hood and the headlight. But I figure the tight fit is a good thing, as less movement means less wear on the paint.
PS - if you want to search for more info on it, try searching for "front end cover" ,which I think is its real name.