Rather than reiterate everything everyone else said, I will simply say that Jeannie was friendly and helpful on the phone as she explained all of my options regarding the size door I would need. She was even patient as I tried to get my dog to stand up and stay still so that I could measure her.
Our installer Greg arrived early, after calling first, and was warm and friendly as well. He measured my dog as well as my old doggy door and suggested which door, of the two that he came with, would be better for my dog.
He was professional and efficient as he installed the door and even helped to encourage my dog to use the door a few times so that she could get used to it. He was thorough in his clean up and provided us with the cut out piece of drywall all wrapped and ready to store, should we need to replace it at a later date.
The quality of the door, installation and warranty can't be beat. It's true that it might have been cheaper to go to my local Home Depot or Lowes, buy a door and find someone to install it, but you get what you pay for. I am very pleased with my new doggy door.