I purchased this smart code deadbolt for my back door in 2009 and LOVE not having to worry about having a key. Especially when I go for bike ride or walk the dog. I can give a code to others and change code after used without dealing with extra keys or worrying about getting the key back. "If" anything would go wrong with this smart code...I would buy another smart code immediately. In fact I did replace my garage door with a smart code lock with handle. Easy to install so I was able to do both myself.