Inexpensive, light weight, ideal in case of an unexpected tire change in the car. (You don't want to change a flat tire without a pad!) It might not be heavy or strong enough for constant use on trailers etc, but it's perfect for not wasting gas hauling something heavier and bigger than you. only needed in rare cases. Personally, I haven't had the problems with loose parts that others have, but I haven't used it that much. Definitely recommended for occasional use.