My favorite thing about this museum is the overview it gives guests of Montreal. The film (though a bit cheese-ball) is engaging. It's on a huge, Imax-like screen and includes projections on the archeological ruins below. The narration covers history of Montreal since its settlement to present day, offering a helpful timeline for first-time visitors.
The archeological exhibit is fascinating. It also includes film projections and interactive recordings of historical figures. I like that if you "talk" with these characters for too long, they will start to ignore you. it's hilarious.
My mom appreciated the elevator access to each floor. But there is no place to casually grab a coffee/snack.
We got breakfast at Olive et Gourmando beforehand, which is just a few blocks away.