but I really like the quality of the small doors

I've ordered and installed two of these doors. I can't speak for the large sizes, as I've gotten the small doors for my cats, but I really like the quality of the small doors. The installation isn't too difficult if you're good with tools. You will need a jigsaw and drill with 3/8" drill bit to cut a hole in your door. The directions that come with the door are very clear and helpful. I would advise using caulk around the perimeter of the pet door if you're concerned about air leakage. Be careful with the plastic screws that hold the frame pieces together as they are pretty flimsy and can strip out easily. They provide a couple extra screws in case you mess one or two up.

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