My cats use the Catwalk pet door and we all love it. I only wish the product was more readily available in the USA as I would like to install a new one each year. The reason is that there are 4 seasons here and the weather conditions can be extreme. The Catwalk pet door is holding up well despite this, but also with 3 cats coming and going many times day and night I might prefer to put a new one in more regularly. Anyway, I am hoping you can make these pet doors more readily available for purchase in the states. The Catwalk pet door is a wonderful product.