I'd be happier with beryllium-copper contacts in the plug. Brass just isn't very springy, especially at higher temperatures.
One question comes to mind: Is the "plugtail" part of the device? Here's why I'm asking.
If I install a receptacle on a multiwire circuit, NEC requires me to loop or pigtail the neutral. With this device, I assume I'd wirenut the white plugtail lead with the two neutral wires. But if the plugtail is part of the device, then that's a violation.
Even if it's not part of the device, if the receptacle is replaced later with a conventional one, disconnecting the plugtail opens the neutral temporarily, which violates the intent of the NEC.
This would definitely be a timesaver when installing a second receptacle alongside a GFCI, though.
