August smartlock 2 is very reliable for locking your door after I leave. I have only had an issue with it twice in all the time I had it, I even have an August smart Lock original. The connection and app keeps getting better though support told me they primarily support apple and don't support samsung android phones. The unlocking is very spotty will work rarely. Support has me reset everything everytime and it will disconnect litterly 3 days later. The door sense works most of the time, though there are times I go back to my my house and found the lock in the lock position even though the door was ajar.  (A minor issue and again happens very rarely only twice) As I said before it locks the door after I leave I would say 99%. It still needs work but is getting better though.