Product and warranty knowledge, years of experience in the roofing industry, diligent, accommodating to the customer, willing to go the extra mile(s) to get the right product to have a satisfied happy customer. This is a professional roofing company, with professional roofing equipment, a diligent roofing team that stay on site until the job is completed. They completed a house roof and separate garage roof in one day, 18 squares on the house and 8 on garage, before the tear off. Second day, a team came and installed seamless gutters, and the third day another team came and installed the leaf guards. Everything looks great, and we are very pleased with our choice of Nienke, one stop shopping, one company for all our roofing needs. Thank you !