I bought this lock over six months ago. Easy to install and works flawlessly. Many times we go for a walk/jog and, before the new lock, we would leave our back door unlocked because we didn't want to carry the keys. NOT NOW! Just push the button, door locked, then just push the code when we return. It's also very handy for our kids and neighbors when they are checking on our house when we're gone. Should have bought one sooner.