It was a very smooth process. They came out and measured all the windows and the doors. Several weeks later, they called to schedule installation. They arrived on the agreed-upon day and went right to work. It was a substantial job, and it bled over into a second day, but they had finished all the inside work on the first day and were simply finishing the insulating, caulking, and finishing work on the exterior on the second day. We have absolutely noticed the difference -- there has been a significant reduction in exterior noise and our air conditioning is working much more efficiently.
Replaced all of our first and second floor windows with new energy efficient windows, including the large picture window over our front door. Replaced two sets of french doors that go out to our back deck with sliding doors.