Kwikset - Halo Keypad Wi-Fi Enabled Smart Lock was super easy to install.  I was able to install within 45 minutes.  Very simple and easy to understand instructions come with the lock.  This replaced an old deadbolt.  Great option of using key, code, or app to unlock.  You are able to lock this from outside the house, as well as inside, without even being in on the property.   Buttons light up for easy viewing.  The great part is that you can see the history of when the lock is used, and who has been using it as multiple codes can be programmed for multiple people.