We finished replacing our windows with Synergy a couple of months ago and have been extremely happy. The folks at Synergy were incredibly easy to work with at every stage of the process. At our initial meeting, Jeff laid out our various options in a clear and concise way and answered all of our questions. He was extremely patient and never tried to pressure us into making a decision. The installation crew, headed up by Jairo, was incredible. They were very pleasant, extremely thorough, and efficient, replacing 23 windows in less than a day and leaving no trace that they had even been here. While one sash arrived cracked, Synergy immediately reordered it and replaced it within a few weeks. We are extremely happy with our new windows. They look great and are a huge improvement over our old windows from an energy-savings standpoint. Most surprising to us, however, is how much quieter the new windows are. We woke up the morning after our new windows were in installed and immediately noticed that we could just barely here the school bus going by our house. Based on our experience with them, we would recommend Synergy to anyone looking to replace their windows.