I have successfully installed the Linear relay on my garage door and integrated it into my SmartThings hub. It works reliably from the physical button on the relay, the standard wireless remote, and the standard wall button. I works about 50% of the time from the phone app.
It is configured to use the ZWave Virtual Momentary Contact Switch and when it works I can see the light on the relay go off and come back on within a couple of seconds. When it doesn’t work nothing happens to the door and the thing does not seem to register that I’ve pushed a button.Sometimes the door will open/close 15 minutes later.
I also experience delayed response from the motion detectors inside the garage occasionally.