When I initially called Beacon Windows, the woman I spoke with gave me a ton of information about sliding glass doors, what needs to be done to maintain/rehab them, & specifics about the doors specific to my condo building. She provided a cost estimate & scheduled the service. The techs who came to perform the work were prompt, courteous, & professional. They were friendly & did an excellent job. When they finished the work, they cleaned up after themselves. The cost was exactly what had been initially quoted. I had renters in my condo unit who informed me one of the sliding glass doors became extremely difficult to open & close (6 weeks after the work had been done on the doors). I called Beacon Windows & they sent techs out within a few days who checked the door & put it back on the track - again, they were prompt & professional. Beacon Windows does an excellent job & stands behind their work.