There’s no current official integration with the Kevo (because of Kevo’s own policies, they don’t have an open API. so talk to them if you want to see SmartThings integration, there’s nothing SmartThings can do about it). For that reason, it has one of the most limited possible integrations of any of the available smart locks, because all you can use is the IFTTT channel.
If you already have one and like it, then definitely explore that option. But for someone who doesn’t already have it, it’s really not a viable candidate at this time.
Just as an example, with the Kevo you wouldn’t be able to lock or unlock the door based on a smartthings event – – its IFTTT channel only lets it be an “if” and not a “that.”
And even as a “if” it’s way more limited than the Z wave or zigbee locks that do work with SmartThings. For example, with the Kevo there is no way to know whose user code was used to unlock the door. You also can’t create time schedules for it from the SmartThings side.
Again, if you have the Kevo and like it, that’s great, but it’s going to remain largely independent from SmartThings unless and until Kevo themselves open their API.
But if you don’t have a smart lock yet, it’s not one I would add to the candidate list.
There is a detailed discussion of locks in the device class features FAQ at post 52 which should be of interest: