We have these on all exit doors inpur house. Easy to attach, great quality. Luckily we have not had to "test" it but it feels very sturdy and offers peace of mind.

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I read the other reviews and complaints about the screws that are included in the kit, and decided to get my own star headed 3" screws. I like mine better than what comes in the kit. I ended up replacing all of the screws in my door hinges (as shown in the photo, a 2 yr old could kick in my door), and used them for this Door Bull too. It fits well against the door, and there is no slack, it's snug, and easy to slide in and out of the groove. For a little more security, it's worth getting one of these, especially if you don't use your front door very often. However, if there's a power outage, and you don't have a battery backup on your garage door opener, then you are not going to get in your own house through the front door if this is in place. Common sense, sure....but there's always somebody that will forget.*Update* I purchased another one of these for a 'safe room' inside the house. During the installation, the cheap drill bit they send with this kit broke inside one of the holes, so I had to cover it with silicone. Advice: Use a better drill bit for installation, and toss the one that comes with it, out, along with the screws. You'd think that providing a nice solid device like this, they would send quality screws and a bit that's not made of pudding. Still, a great device for security as long as you use your own hardware.

This is an awesome product that works if you throw away the included cheap junky screws and go buy some good screws at the hardware store

Easy way to strengthen door without being a carpenter or having experience with this type of device. Installed within 5 mins and seems to do the job well. My only gripe would be the supplied hardware is fairly cheap from the drill bit to the actual screws. Had 1 screw strip easily when following directions to swap out one of the screws in the door hinge. All in all a neat device that would garner 5 stars with some better included hardware.