Testimonials The work by ESI technicians is unlike any I have ever seen. They are always on time, professional, and make things easy to understand. Terrence Banner T&C Green Solutions We have been a customer of ESI for almost 20 years. The staff is terrific making the overall service experience awesome! Michael Trautmann Springfield Improvement Association & Archives Over the years we have used several companies for our security needs. There isn’t one that compares with ESI. The level of customer service, cost, and state of the art technology is outstanding! Adam Halstead Trautmann & Company I want to thank ESI for the great job they did on my home security system. They were extremely professional in installing the system, and they are one of the cheaper security system companies in town. Mike K.