Good Product - but you pay for it....
I've had Hale Pet Doors for 15+ years. They are quality and generally last. Installation is pretty simple with basic construction skills (through the wall). My only reservations is that over time (several years) my silicone door flaps shrank from the sun, and leaked at the edges. I bought a replacement flap kit ($188 JUST for the replacement kit) and the mounting screws were not long enough. I fixed it with a trip to Home Depot, but for that price you'd think everything would fit, right?! ....It is in, and seems to be working with the new $1 screw kit.