I bought two of these and absolutely love it (Front and back door).  I purchased the gateway as well so I can remotely lock/lock as well as check the status of my front and back door.  I love never having to pull out my keys to get in or out.  Works exactly as described.  I'm going on about 1.5 years with this product and can say after using it for this long that I'll never go back to a traditional key.