We had a very old system and PC worked with us to replace only what we needed. They did not try to up sell us on other items which we appreciated. We met with the company owner, Jules, a few days ago and he spent a lot of time at our home making sure we had all of our questions answered. A crew was sent just days later to install the product and they did a great job! It was the father-son team of David and Tim. They were very experienced. I've already experienced the response time first hand as a fire alarm was triggered during installation and it seemed instantaneous. I definitely recommend them and their monitoring service.