I use one for long trips only, and it does a fine job. Regarding leaving scratches, you need to take the proper car to insure that doesn't happen. Slapping a fresh coat of wax on the car before putting the mask on (making sure the back is ABSOLUTELY clean) will go a long way to keeping your car safe. Additionally, don't leave the mask on very long. Crap accumulates back there like you wouldn't believe, and that helps create those scratches. Take it back off and clear everything off the felt regularly and you'll be fine.