We installed the Kwikset - 915 Smartcode Traditional Electronic Deadbolt lock and are happy we did.  You can use the lock with the key or the key pad code.  It's perfect for when you are going out and don't have your keys with you.  It's great that you don't need to fumble with keys to enter the house when stepping out for a walk or a quick errand.  It's very functional and looks great too!