My bra doesn't move across the paint. If a bra shifts at all it'* not tight enough.
Personally I don't see the point. Sure it would be good for protecting from rocks and bugs, but they look ugly so what'* the point? It'* not really going to do much for resale to keep the front protected, and I have never used one but I would think they would wreak havoc on the paint regardless of how tight you keep it. It will still move around across the paint
A bra is not a cosmetic modification – it'* not meant to make the car look better. Sure, it should
look and fit well while it'* on the car (and GM bras like mine do), but its sole purpose is to keep the paint and body in good condition. NOTHING looks better than a front end without
a bra on. Resale value doesn't matter, people just want to keep their cars in as good shape as possible and prefer to use one. If someone'* driving conditions could benefit from using a bra, it makes no sense NOT to use one just because the car doesn't look as good with the bra on (It'* like risking getting some disease instead of using 'protection' because it feels better without it.
). Sorry for that analogy, but it'* true!
As far as damaging the paint, you just have to be careful the paint is really CLEAN before you put it on. This means using a claybar on it, a paint cleaner, and some wax. Wash the car AND the inside of the bra carefully with mild soap often. Don't let the car sit for long periods with moisture/rain/snow or in hot, dry weather in direct sunlight. IMO if you are very (maybe extremely) diligent when using one you won't have any paint issues. So far I haven't had any adverse effects from mine.
But I will report back if I have issues.
As far as keeping it on in the winter I wouldn't even bother. There'* so much dirt, sand, salt on the roads it would be a huge PITA to keep it clean and more risky to the paint. I definitely won't be using mine this winter.