I had one of these when I first moved out to go to college, and I loved it. I'm recently on my own again, and feel much more secure with this in place. There has been a rash of kick-in robberies in my neighborhood recently, and this will definitely stop anyone knocking down your door. For those who have said it doesn't work, they must not have read the directions. You have to kick the bottom foot in place to secure it once you've placed it under the knob. Both ends are sturdy rubber, with a slight give to make it easier to put in place. Along with the many holes, it is highly adaptable to any height doorknob.