Bagwan,

I don't think they will be all that bad. As the demo car shows, they won't have any major protrusion out over the tire, and attachmnt points are to the inside. The only thing that would rip them off would likely be something going over the wheel itself, and usually in that case things have gone bad already. Overall there should be a lot fewer small bits subject to launch on car contact or a heavy curb hit, which is a good thing IMHO.