We've had the first generation Smart Lock for years and have loved the fact that we haven't had to carry a house key for all that time.

But, it was just a little bit funky - occasionally not opening when we got home, having to reset the app to make it work from time to time, and it was physically big. And I gave up trying to get the WiFi bridge to work.

Clearly, none of these issues were deal breakers and so we recently upgraded to the 4th Gen with built-in Wifi.

What an awesome upgrade! The lock is physically smaller, it feels more substantial and has a quality feel to it when you use it manually. And the connection to my Android, my wife's iOS and our WiFi has been seamless.

Totally love it.