"Looks like it's always been there"
This is a very fine door and really is very easy to install. It looks great, has a well designed handle and lock, and closes properly every time. After repeatedly reading and rereading the instructions, it took about 90 minutes to complete the installation. My neighbor--who knows I'm not an all-pro handiman-- viewed the finished door and said, "Wow, it looks like it's always been there."
Although the instructions repeatedly emphasize not to try to install the door if the "mount" area is too
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narrow, use your own judgment on that. Our door had a mount area much narrower than recommended, but it went in just fine, and is very secure. I wasted money on the "narrow mount kit" that turned out not to fit, even though they should have known that I had an 84 inch, not 81 inch door.
The only weak part of the door design is the system holding in the detachable screen or glass. It works, but takes some finesse when removing and installing each piece. You have to be careful not to bend the detachable strips the wrong way, or you can ruin them.