I've not used them at my properties...mainly because of cost...but I do have them on my home. Ours are Yale with electronic touch-pad code entry and has the ability to be remote opened via app. It also has a regular key mechanism. I've had it for two years with no problem. Battery has to be changed about once a year. It's a lifesaver - no worries about lost key. We don't even carry the keys. I'm pretty sure if I were to implement on a property, I would not give the key to the resident, just a code with a separate code for management/maintenance. You can pull logs to see what codes were used and when, should there ever be a question of improper entry. From a property management standpoint, I can see it being a real time & money saver... no more after-hours lockouts. Resident can remote open for guests, deliveries, etc if they choose. You'll have to be meticulous about changing codes at turn, but the process is simple and quick. You'll have to make sure also that residents let you know as soon as the low-battery indicator starts beeping. (You have about 3 days to change the battery before it dies at that point. One thing I have not considered or looked into is how easy it would be to hack.