We were given an arrival window of noon-5:00, and that the technician would call 1/2 hour before getting there. The tech arrived at 4:55, no phone call before hand. We were getting concerned/upset because my wife had stayed home from work, only to have no one show up.
However, once the tech arrived, he was friendly, pleasant, professional and courteous. He did the work without fuss, and patiently explained everything to my wife. When I came home, he took the time to go over everything with me as well. I guess only time will tell, but from what I see, the work was excellent and I saw for myself the amount of dust/debris that came out of the ductwork.