I've been here a handful of times - once when I had a train ride from NYC and when I took a side trip up to Quebec City. Since I'm from a city that prides itself on using cars, it's refreshing and a bit nostalgic when I get to travel by trains and go to train stations.
This train station is definitely much prettier than some of the stations I've visited along the east coast, and I like the availability of shopping options- including a drugstore, many food places (yay! Tony Horton's), and shops. I typically don't wait here very long, and the Via Rail service is pretty easy to use.
If Montreal is part of your future travel plans, I'd try to get some rail travel in and use Via Rail.