We can get a 3% discount for paying cash for our roof instead of writing a check. Do you see any disadvantages of doing it? My only thought is the warranty through the manufacturer, but the company is an Owens Corning Platinum Preferred contractor and has been in business for over 25 years. They have a good rating on both Angies List and the BBB. There is a 2% upcharge to put it on a credit card.