Love this concept. We have it on the side door that everyone uses. We can set up multiple codes. The trick of using 3 fingers to activate it can be challenging.  I find myself having to press the keypad multiple times. But it works well otherwise.  For the install, the electronic part was easy, the actual passage set for the bottom doorknob was more difficult. We had an issue with the actual locking mechanism in the passage set, it sticks.... which could be a problem (keep us from getting into the house)....