I have purchased two of the 909 SmartCode Electronic Deadbolt locks for my home. I had issues with the grandchildren losing or forgetting their keys so I put these in. They work like a dream and I chose a number that is easy for them to remember (i.e. - their birthday) and I can very easily change the code if I choose. The locks are very secure. I also had some issues with the locks not closing properly but I contacted Kwikset and they told me how to fix my problem. Very easy and they were great to work with. I believe I may even get a lock like this for my kids house as a gift.