Hey guys, i just did this Amtrak trip, and it was awesome!
I went from New York to Montreal with Amtrak ($50) the seats were huge, with tons of legroom, and a pullout recliner. The scenery is really amazing, (half of the way u are driving right along the river.) There is outlets and pullout tables at every seat. They even have a snack car to buy snacks and drinks onboard. There were also quite a few seats empty so i had 2 huge seats!
The way back Montreal to New York i went with Heiman's Bus ($65) the seats were cramped, no legroom, the bus was packed, crying babies, and the list goes on...
Buttom line is, if u are ok with Amtrak's unconvinient schedule, go for it, it is way more comfortable.