I had my interview yesterday at YUL (moved it earlier twice, as openings appeared); it went very smoothly (though, why both the Canadian and American agents need to explain exactly the same thing is a little overkill). The American agent hadn't known (and I still don't think believed me) that one could change the interview date on the website without contacting them directly.

Happily, there were only three cars ahead of me at the border on my way home to Connecticut for my last non-NEXUS drive.

We originally scheduled my wife's interview at YUL for next Monday, but a slot opened up today for this Friday, and we jumped at that. I probably wouldn't have looked as frequently to reschedule without the information I'd read on this forum. Thanks, all!