Over the past few years we have encountered a dozen or more instances of robberies where the front door was kicked in and homes were robbed in a matter of 2 or 3 minutes.
Although it's not perfectly home-invasion resistant, this product is one of the stronger devices I have seen.
Small chains and sliding locks work very poorly under pressure.
You can look up a "Mythbusters" episode on door locks and make an informed decision for yourself.
The solid double strike plate in the picture costs about 15-20 dollars at your local hardware store and you can drive screws straight into the wall frame.
However.... I have installed many of these for people who were terrified of break-ins and there was a window right next to the door!!
Think about all aspecs of your home security before just doing one thing.
