Approximately 2 years ago we had Windows By Installer replace our patio door. Vadim was an excellent sales rep: very helpful and knowledgeable. After several delays from the company and our post on this site, we finally got them installed, only with the assistance of Vadim who stepped in to help us out. This past winter we decided to replace the rest of the windows. After a successful resolution to our last problem we decided to give Windows By Installer a second chance. Vadim was very helpful and friendly when he came out to discuss our options. We paid our deposit and were told it would be approximately 6 weeks before they would be ready to be installed. After an extensive delay in getting an installation date firmed, we had our windows installed about a month ago. While the delays in getting them installed were frustrating, the installation and final products are great. The installers arrived at the time that they had agreed to arrive at. They replaced all five windows in a timely manner. They cleaned up (most) of the mess, leaving some, including broken glass on a bed and the deck. Fortunately it was easily cleaned up by me after they left. This was disappointing compared to the excellent clean up that was done following the installation of our patio door by this same company, two years ago. The windows are great: They open so easily. There seems to be very little heat transfer on these hot days. We no longer hear cars going by in the front of the house and barely hear the trains at the back of the house. We are very pleased with the quality of the windows. I would certainly recommend that you deal with Vadim. He know his stuff. He will give you the best possible deal on the best product for you. If you run into any challenges with the other aspects of the company, he will be in your corner to make things right. At the end of the day: great windows; great price; great sales rep; excellent installation. Thanks again, Vad.