We've had it at YVR for a couple of years and it's definitely not faster than Nexus.

If YYZ follows YVR's pattern, once people get used to the machines all returning Canadian Residents will be sent to the kiosks and the podiums will be down-staffed.

At YVR this means you can use the machine pretty quickly, but there's a fairly long queue to speak to the officers posted post-machine (pre-carousel).