I wanted a cheap lock to allow key-less entry to my home. I also wanted to tie it into my home automation system (OpenHAB). There are more pricey locks out there that would include bluetooth/wifi hub systems, but besides the price, I found a lot of them with their push keys or displays a little too gaudy or over-the-top for my liking. I liked the simple "not too showy" look of this lock from the exterior.Installation: I installed it into a refurbished door which already had some holes in it. If the holes aren't positioned well, the lock's mechanism may have too much friction for the gearing system to work reliably. So with my door I had to hold my mouth right to have it all work smoothly.Tips: I found that cutting the cam bar to size helped minimise the effect of not having perfect alignment between outside cylinder and inside latch mechanism. I also lubricated the dead-bolt mechanism and made sure it was true. People say to use Graphite powder but I used a small amount of Vaseline (petroleum jelly) which really helped. I also used a couple of extra screws to secure the inside end of the dead-bolt mechanism to minimise any play. I have found that as the batteries get low you will notice the lock operate slower, so if you can minimise friction, you will find the batteries are able to last longer. Make sure you buy batteries that can supply the required current to operate the gears. I tend to change the batteries before I start having problems and you can quickly appreciate a more zippy and shorter sounding lock/unlock.I set one of the two remotes up to be controlled by my raspberry pi (OpenHAB) system, powering the remote with 5V and switching the lock and unlock buttons with relays (to simulate a quick press). I also installed a push switch in the door frame to tell me whether the dead-bolt was latched or not. This then allowed me to update my system or log when the other remote or key was used. This was worth doing as it allows anyone with a smart phone (and access to the home automation) to unlock the door (I also unlock it with my Gear S3). Also, it means that you can let people in remotely if needed. I have set it up for Alexa Echo & Nest Mini to lock/unlock the door, setting up a rule to lock the door with a delay was also helpful.So overall, I can sympathise with some of the 1-2 star ratings although my remotes and lock work well, I can imagine that some doors might make it more difficult to have success. If you are wanting a project for your home automation system or simply would like key-less entry for you home, this can be a very cheap yet smart looking solution.