I bought two of these 3 1/2 years ago, and they have worked great! I didn't have WiFi at the time, so needed a smartlock that didn't require the Internet. The only problem I had was a battery that leaked and damaged the battery case (not the fault of the lock), which I replaced. I have only just changed my 3rd set of batteries, so an average of more than a year for each set. A very reliable and great lock!