I am collecting my new Mercedes-Benz this weekend, and when signing the papers, the salesman brought up the option of buying GardX paint and upholstery insurance. The price was discounted but still substantial. Is this a product you would recommend? My annual mileage is about 18,000 and I will keep the car at least three years. Other insurances were also offered: tyres, paint chips, alloys, but these were not of interest.