My friend recommended this company to me. At first, I hesitated to try and only bought three windows from landmark. Turn out, the entire process was professional, very impressed. The sale rep is very knowledge and explained a lot vital things to me. The customer service is excellent and our concern had been solved immediately. The installers are very competent and polite. They kept our home clean during the installation process and I really appreciated that. The windows make our home look really lovely and we saved a lot of money on the energy bills. After that, I purchased four windows and two doors from landmark. I highly recommend landmark to me. Do not hesitate, just try it!