I have had this Kwikset SmartCode Deadbolt for just about two years. I cannot tell you how wonderful it is to not to have to worry about being locked out of your house. With no keys needed, it's a simple code that you create that can be changed if and when you need to. You can also have an additional code created to allow a guest to enter if necessary, possibly to check on your home while you are away. This code can then be deleted or changed. I feel very secure with this lock as it will only allow someone to try the combination a few times before it shuts down and will not allow any additional attempts for a certain amount of minutes. I love this lock!