A roofing project is a long term investment with much to consider.  The experience and longevity of the roofing manufacturer is every bit as important as the company installing the system.  With the materials designed to last 25-50 years plus, you will want to be sure the manufacturer will be around in 10, 20, or 30 years in case you have a problem.  Be sure you choose a manufacturing company who has been in business through multiple roof cycles and has grown with the industry.  Choosing a quality manufacturer will ensure you do not get stuck over the term of your investment.