I've had a LeBra and a Wolf bra. The Wolf has a more paint friendly lining, and spoilers, but you must remove the wheel well liners in order to install and remove it. It uses a bungee cord system. All bras should be removed about every 2 weeks and the back side of the bra and the car should be washed. Most manufacturers recommend using a bra only on a factory paint job.
The LeBra is easier to install and remove, since you leave the attachments on the car. These are in the form of clips which go under the wheel well liner screws, and velcro that is inside the upper lip of the fascia. The lining isn't as paint friendly. Wash the car and back of the bra often, and keep a good wax job on the car. Again, original paint holds up better.
Keep in mind that the screws for the wheel well liner have in most cases been there for 15+ years. The plastic pieces they screw into aren't favorable to constant removal and strip easily. Both bras fit snugly and there was no indication while driving that the bras were moving around, but then you can't see the bra from the driver's seat.