Writing this review after several months with my kitty pass. Installation intitially was relatively easy though I found that fitting the 3 parts together was awkward. You really want to pull your door down to give yourself easy access for cutting the hole. It looks fantastic. But the double sided tape failed after a few weeks and I have since had to glue the Kitty pass back onto the door myself. So be prepared for this. They simply don't supply enough tape with the portal. Its also a little on the pricey side for what its worth, but I think the supplier gets away with the pricing because it is a superior looking design to others on the market.