Pretty easy to install with the right tools. Comes with a drill bit for the screws that hold the two frame halves together. I like this design because it seems simple, strong, robust, and easy to maintain. the flap is thick and has some coating that prevents yellowing. I bought my first one in 2014 and 6 years later, it is still "clear". Some cloudiness but likely due to me scrubbing my dog's nose water and mud off of it. I purchased a second because I moved. In high wind, it will flap around a little. Maybe buy the weather strong version if you need it. Only one dog 65 lbs. The guard appears to be 1/4 acrylic, has a spring loaded screw to secure to the frame. Improvement from the last one I had, which was only spring loaded pin. If you knew where to push, you could bend and push the cover off from the outside. Threaded design should be more tamperproof.