Almost perfect
The panels are easy enough to install, if you have two people. I didn't. However, I used two-sided tape at points alone the top of each door panel and that worked just fine. The material is easy to cut and to work with. My one complaint is that they do not include enough screws. I bought a 150 count box of matching screws at Home Depot and even that was not quite enough. I have three 10' x 8' doors consisting of 5 panels each with a total of 4 hinges between panels and on 9' x 7' with 4 panels and only 3 hinges. I felt it necessary to use a screw to the left of the right edge, one between there and the first hinge, then one on each side of the middle hinges, one just right of the left hinge, then one on each side just below the side hinges. Then I repeated that for the bottom of each panel. Keep in mind that you have to the material at each hinge to allow it to lay against the panel flange. That is a total of 20 screws per panel. They only send 48 screws which gets you two panels and the start of a third. Have not had any extreme teimpuratures since installation so can't comment on effectiveness but can't help but expect it to do a pretty good job.