Are you comparing a company that has high amounts of both general liability insurance and workers compensation insurance? It the company licensed in the state? Is the company buying high-quality commercial chemicals and cleaners, or they having to compensate by turning up the pressure on their machines or going to a smaller degree angle nozzle?
Is the company confident that they will not force moisture problems into the house that could cause mold & mildew problems later? Is the company confident that there will be no chips, gouges, splintering, breakage, or other damage. Is the company willing to prove their amazing results by doing a free sample spot demonstration at your location? Does have happy and repeat customers?