Jeff and his team arrived on time, and got 24 windows replaced in a single afternoon. Jeff did a walkthrough inspection with me, as well as explaining important details about the windows and their configuration.
The warranty is even more impressive; I have already had two sashes replaced. One was broken during the shipping process, and the other had a very minor scratch. Synergy is dedicated to me being happy, so they replaced the one with the scratch at no charge.
The customer service is what you are paying for, and it's well wroth the price, but the quality of the windows is also extremely impressive.