Leviton are generally good switches, but there is a known issue with the most current generation where if you press the auxiliary switch at the wall, smartthings does not get notified when the lights come on, even though it should. These are the models which use the “digital” auxiliary switch.
Leviton is aware of the problem and has said they hope to issue an eventual Firmware update, but since Smartthings itself doesn’t do zwave over the air updates it’s unclear how smartthings customers could apply a fix even when one does become available.
So if you are going to set up three-way operations, this is just something to be aware of with the newest model of Leviton switches. It will be an issue for some people and not for others depending on specific use cases.