My cousin put this on his house it took me 9 kicks plus just jumping into the door to get it open and the only reason it opened was the door frame broke, he was a little pissed because we had the new door sitting there to replace after the test but we didn't have the stuff we needed to fix what I broke. He even bought it for his inlaws after we tested it, it is not an end all solution but it will buy you time to arm yourself and take up a better defensive position instead of just sitting there watching TV and your door flying open.