PROS:- Installation relatively simple, under the right conditions.- Extremely non-invasive option. Sleek / smart design.- Very good option for doors with limited space.- Should provide occupants with more time to protect themselves.- May deter the vast majority of intruders due to increased time and effort needed to gain entry.- The hanger is a good idea and helps to keep the device available at all times.- Installation can lead to awareness of other potential weak spots (that would otherwise go unnoticed)CONS:- The price point is slightly high. Worth the investment, but may deter some from purchasing.- Screws provided strip far too easily. Do not use them.- Dependent on integrity of door installation.- Calculating installation depth of base can be tricky.- Can require a higher than average aptitude for construction.- Only works for in-swinging doors. This is not a big deal, but is important to know.- The makers of this device need to have more videos available showing the capabilities of their product. Many other devices have videos from various sources testing them. This one does not. The lack of sponsored and independent test videos almost prevented me from purchasing the device.RECOMMENDATIONS:- If you have an older home, or are not handy (in terms of construction) get an experienced person (friend, family member, trusted handyman) to install it for you.- Use star-head screws purchased from hardware store (or Amazon!). This is an absolute MUST!- You will need a relatively powerful drill.- Watch YouTube videos and install 3" - 4" screws into hinge-side of door as well. Use caution, this can alter the door's ability to close properly.MY EXPERIENCE:Thankfully, I have some experience in home improvement and construction. I installed The Door Bull on two of my entry doors. The front door went relatively smoothly. I did notice, that if you have the means and desire that a person could install more than one of these to a door, potentially increasing the effectiveness.When I went to install it to my metal garage side entry door (a door I thought was the most secure in my home), I found that it was improperly installed and very vulnerable to blunt force. I had to remove the trim and place additional wood in the gap between the door frame and the wall stud. I then had to use 4" screws to ensure a solid connection from the frame to the stud. This is not a knock on the Door Bull. In fact, I was able to correct the problem because of the Door Bull. Now, that door is very secure.This device will not "prevent" entry into your home. It may effectively slow entry and/or deter entry. I have recommended it to my family members and friends.