Update 1/3/2022 - This lock is not compatible with ES Impact Doors. Recently replaced old door with ES-MX3000 door. The new door accommodates a Schlage deadbolt lock, but the door needs to be securely closed for the deadbolt to fully engage. This August lock will not engage the deadbolt under normal conditions.I had a Schlage electronic combo lock on my door and it was not listed as compatible with this device, but as it turned out, it is. I did have to remove the inside lever (and battery, electronics, etc.) and replace it with this August smart lock, which rendered the combo lock useless, but still allowed me to use the existing keys when needed. Of course this device does provide the same deadbolt security (it uses the existing mechanism), while adding Wi-Fi and BT control via apps. I programmed it to auto-unlock when I get close to my door. You can program it to auto-lock also, but if you go out without your phone and/or key, you could find yourself locked-out. So, when I leave, I got into the habit of using my phone to lock my door. It is very cool as I get close to my door, the app sends a notification welcoming me home and letting me know that my door in being auto-unlocked.The install process took all of about 10 minutes. The instructions were quite adequate - just about removing 2 screws and reinstalling them with the smart lock's mounting bracket.The only issue I had was with the Wi-Fi connection. I did have to get a range extender and position it close enough to the door to maintain a persistent connection to my network. My advice is to buy the highest speed and greatest range extender you can find. They are not all the same, and they need to be placed where they get good signal from both your router and the devices that connect through it. It took some trial and error to find the sweet spot, but I do now have a stable connection. Tech Support was of no use.8/24/20 - Update: While the device works pretty much as advertised, there is a bug with sustaining a Wi-Fi connection. I reported this to tech support and emailed them log files several times. They said that they created a bug report. Several times during a 24 hour period, I get notifications that the connection was lost, followed immediately by another notification that the connection was recaptured. They claim that -60dB signal is required. The app reports that the signal strength is -41dB - much better than the minimum - and this is with 13 feet between the door and the range extender (see the picture). It also seems to go to sleep, as when I check the lock status, sometimes it says "Unknown", eventually becomes known and when I check the signal strength it is typically -41. I have a Ring door bell cameral on the otherside of the door that does not have this problem, using the same range extender.9/12/20 - Amazon customer support sent me another August smart lock, but I sent it back as after moving my range extender within 10 feet of the door (see pix) the Wi-Fi connection stablized and stopped sending disconnect notifications. I am updating now as fresh batteries seemed to die after less than 3 weeks (8/26 to 9/12). All BT and Wi-Fi connection was lost. I replaced the batteries and BT became active, but no Wi-Fi. I tried to reconnect to the network using the app. - NG. I finally did a factory reset and started a new install. That worked. This tells me that you need to pay attention to the status of the batteries as the device/app does not warn you. Also, when the batteries die, the device forgets who it is and needs to be reinstalled after you replace the batteries.