I just finished installing this cover. If installed fairly easily even for one person doing it without a helper. The trickiest part was pre-drilling the holes for the hinges and getting the device hung by the hinges. With another person holding the bulky device, this part would be easy.
I also added some additional rigid foamboard insulation on top of the attic door and between the door and the Laddermate to increase the R value.
The reason I bought the Laddermate was because it was the only insulation device I could find that would install inside the room on the ceiling. This was necessary because my attic door was installed about 50 yrs ago and the stairs don't fold like modern ones. Instead, the ladder is one solid piece that slides up into the attic before closing the attic door. The result is a 10 foot ladder laying on the attic floor and attached to the attic door. None of the in-attic insulating devices would work with this configuration.
For most modern folding ladders, the Laddermate is probably big enough, but I would probably choose an in-attic insulation fix if this was possible.
I mis-measured my attic door before ordering the Laddermate and discovered that the Laddermate was not long enough to cover the entire opening for my attic door. I solved the size problem by covering the remaining part of the door with rigid foamboard and weatherstripping. I will paint the Laddermate, the foamboard and the ceiling when the weather warms up. The aesthetics aren't the best, but it should do the job.