I took the bus on a Monday, coming from the airport everyone had a seat and it was a fairly comfortable ride. Coming back, it was packed so I had to stand the whole way (~40 minutes). It was a warm day in Montreal so in addition the bus was hot. Not fun. Wish I had taken Via Rail back to Dorval instead, oh well.
Isn't Gare Windsor (the West Island, Hudson etc. commuter rail station) now known as Lucien L'Allier?
Whats left of Gare Windsor doesn't function as a train station anymore. The newly built station which has commuter rail out of it is Lucien L'Allier.