I have never used the service, nor would I. I walked in dealerships armed with firm price quotes. First off, like cars, the invoice price is not the actual price. Don't account for factory incentives, dealer volume discounts, etc. According to 'invoices', I paid less for my cars than the dealer did. Sure. And I really do want my dealership to stay in business. Don't do me much good to by a tractor one day, return for service the next and find they closed their doors!