Linear makes many different different devices.
The one that they make specifically for garage door control is the GD 00 series. (GD stands for garage door). This is the device that has been UL listed for unattended garage door operation. It is also sold under the gocontrol name.
The nutone device is a rebrand of the GD 00 device.
There is also a linear relay intended for lighting control which some people use to hotwire their garage doors. That does not have the safety features, and is UL listed for lighting control, but not for unattended garage door operation.
So just wanted to point out that people have been talking about two different Linear devices in this thread.