I have had this lock on my front door for three years. The advantages are numerous: one less key on the key ring, illuminated keypad, never lock myself out, easy to give the code to relatives, friends, dog walkers or anyone needing access to your house without you present. But, most importantly, when my wife has to run back in the house to get one last thing, I don’t have to turn the car off so she can use my key.
When the 9-volt battery start to go the keypad blinks, so you don’t end up getting locked out with a dead battery. (It will also accept a key).