I'm very happy with this purchase as it is exceeding my expectations.  Not everything is perfect, for example, sometimes (more frequently on my wife's android phone vs. my iPhone) the app seems to stop working; however, killing the app and restarting it is a simple solution to bring it back to life.  I certainly hope those kinks are worked out.   I was also concerned as the front door is in an unheated area and temperatures dropped below freezing regularly during winter - the lock operated perfectly in those conditions.