SEI offers more cost-effective and flexible post-warranty maintenance services compared to Original Equipment Manufacturers (OEMs). SEI can service multiple manufacturers and models, offering lower pricing that is 30-60% below OEMs. In addition, SEI's service agreements are customizable to customers' unique needs, while OEM agreements are typically inflexible. SEI also provides local parts and certified engineers to resolve issues across different systems. Overall, the document argues that SEI provides better value than OEMs for post-warranty maintenance through lower costs, wider coverage, and more customizable support.