I bought one of these in August of 2014. Installation was easy and it worked perfectly right out of the box My wife liked it so much we bought additional locks for each of our daughters for Christmas presents. One daughter installed it herself Christmas evening. We all are using the locks on the entrance doors between our houses and our garage. No more getting accidentally locked outside. Only issue what has developed (only with one lock) is it occasionally sticks when using a key. I plan to put some graphite in the lock to see if it resolves the sticking problem..