I put this on my back door initially not sure how I was going to like smart key system forgoing any key and basically typing a code in. I have serveral passwords that I tend to forget so what if I forget this one. So I opted for the back door. The setup was super easy to install. As for the keypad I literally think this has become the best thing in my life. I do have a key but not sure to as where it is so I just leave my door unlocked. Or what I would do but now I can lock the door. As for the device itself besides installing being easy. I can give temporary passwords to people and also remove them when I want. It