I have purchased and installed every version of of August smart lock and this latest model is one of the best. It is fast, responsive and the knob turns very smoothly. I hesitated purchasing this version for months due to many bad reviews but the Prime day deal is too hard to resist. I believe the connection problem that others are facing could be due to poor WiFi signal at the door. I suggest installing an app on your mobile phone and test your WiFi signal strength at the door before placing an order. I am very happy with it and would recommend this smart lock to a friend.