Any thing electronic will be susceptible to failure. I got a reputable one more than 6 months ago. Its motor unit failed shortly after installation and need warranty claim to replace the faulty unit. During the time of failure I have to use manual key to operate the lock and hence my advice is if you are getting a smart lock get one with manual key. It sounds obvious and most will have this but still need to make sure this feature is available.

Pros
- remote monitoring and lock and unlock
- multiple options to unlock from numerical pad, thumb print, auto unlock, NFC, manual key, app, etc
- integrate to Alexa or Google
- temporary vs permanent user passwords
- Auto lock
- simple to use. Keyless entry

Cons
- many of these are not the most robust against burglary. Generally more suitable for gng community
- good ones with great features and tough against burglary are not cheap
- need to watch out on battery level. That said my lock battery level still HIGH after 6 months+ of usage. You will get alerts when the battery is low. Anyway my lock can also use power bank to connect to the lock as emergency feature.

The security of the latest generation of locks are better but any connected device will still have vulnerability. If you are considering smart lock it should be complemented with security camera and system ... just to be sure. I think this is the tipping point where the benefits starts to outweigh the risks.

In my case the gng security is already good that security of the lock is not a major concern. Despite that I still have a security camera installed.