I bought the Yale Assure SL lock with the iM1 mode when it was released. I especially liked it because it completely eliminated the key. I was in a successful attempt to remove all the keys in my life and this was the last one.

Aesthetically, the outer keyboard is lit. The interior panel is a little too big and bulky and could certainly use some size reduction.

As a lock on the "mute" keyboard door it works well. If the blockade, and Yale as a company, fails terribly, they are in HomeKit integration, functionality, reliability and business integrity.

The Yale app and the lock are notoriously rudimentary, with little in the way of the common features of the smart home. There is no PIN programming or usage log, for example. It accepts a number of PIN codes and that's about it.

The Yale app is almost abandoned. Updates are few and far between, without significant improvements in obvious usage issues. For example, the app has been updated to support the iPhone X screen and several months to support iOS 13.

The worst thing about this jam, though, is that the HomeKit module stops working - it had burned itself - and Yale won't support their faulty product.

The symptoms are consistent and have been experienced by several people, including myself. Blocking gives up HomeKit and runs out of batteries in a few days. When I contacted Yale, their answer, without even trying to solve problems, was that I had to buy a new iM1 module.

In summary, it seems to me that Yale thinks I'm selling a disposable door lock - like a disposable razor blade. A brave new world.

I'm old fashioned and expect my door lock to last for decades, not a few years. If you're the same, don't buy Yale's lock. It's flawed and Yale won't take responsibility and fix the flaw.