Process with the salesperson was smooth. He provided a good overview of their product, listened to our needs, and made a recommendation. He was responsive enough to competing offers in terms of price to win the bid. Installation was extremely poor, however. The installers tried to leave with more than a 1/4" gap between the bottom of one window and the house saying, "You're house has a design making more proper fit impossible." UNTRUE. He was only allowed to leave when the window was installed correctly-- and he did find a way to make installation work just fine. Similarly, initial installation of 2 of the other windows had issues that needed to be corrected before we could pay. We initially did only a cursory check of the attic insulation-- the 5' close to the attic entrance was well insulated. 6 months later, however, we found the full truth-- Advance had done a HORRIBLE installation of the insulation. They had completely plugged the vents in the attic with insulation-- putting the foundation of our roof at risk of mildew and rot from insufficient venting. Two other major issues with their installation of the insulation: 1. More than 1/2 of the attic had NO insulation whatsoever! 2. The had done no check for large gaps in the attic, much less smaller ones. If you have a big gap below insulation between the attic and your home, the insulation doesn't work. (Think about having little pieces of insulation acting as the primary insulation to a doorway, rathr than a door) The customer service manager was responsive, suggesting they would come to correct. THe first time, they cancelled politely. The second, they didn't show up. The third time, they came (6 calls later.) They began the re-installation wrong again, after seeing some of their egregious mistakes (but not understanding some of the others), and had to call a manager to discuss. The manager began (again) with, 'It's impossible to...' By slowing him down, explaining carefully, and how it would not take too much of his guy's time, we convinced the manager he could correct the insulation, and it would be appropriate to do so. He did provide some nice advice on another project at the end, but... I see signs the Advance organization makes efforts to be responsive to customers. I see signs that Advance could be a good service provider. To realize that potential they MUST improve their processes and quality control-- at least relative to our experience. Overall, I'm just glad that Advance mistakes on a $1,000 insulation job didn't cause us to have to spend $100,000 redoing our ceramic tile roof.