Only reason I did not give a 5 was due to the issue of looks after the initial installation. Recommended to John to show pictures of what it would look like if not run through roof. He said they had already met and discussed that you would in the future. Still very happy.
See comments in number 1.
I came home after the work was done and was surprised at how clean the house was. My wife was very complimentary of the job done cleaning up which is saying a lot!