Very clean, easy to get to airport.
Going back to NY from Montreal was a complete breeze. I literally walked right up to a customs officer, done in minutes. Security was also very quick and they didn't make you feel invaded.
My flight was at 1:30 and I was waiting by 12:00 at the gate. Usually I'm early, but I expected more of a wait. There was a nice little bar by the gate, where I had a drink and sandwich waiting for my plane.
Very nice experience.
A taxi ride from the airport to Montreal is $38. Much like in NYC it is a fixed rate.