I had my whole house generator installed by Generator Power Systems almost 4 years ago. They did an excellent job with the site selection, the concrete slab, coordination of the gas meter upgrade, and the generator installation. I have also been using them for maintenance of the system and will continue to do so. For me, they seem like honest people with fair pricing and they always respond quickly when I email and answer when I call. I have been very happy with my generator system as it has worked flawlessly, keeping our house running during the occasional power outages that we have experienced in the past 4 years.