most car bra's are pretty useful, that one looks like an exceptionally poor fit though.
I'd consider one if had a new car and was doing a long distance trip, help save a few stone chips etc.
Allthough leaving them on all the time doesn't ruin your paint as such, but the paint under the bra doesn't fade from the elements, so when you take it off you can find yourself a two-tone bonnet :o

