As far as renting a car, it is likely a very good choice for anyone that is
arriving in Montreal later in the day.  I have a choice of one direct flight
to Montreal that puts me arriving in Montreal > 7pm.
FYI, there is a direct bus from YUL to Quebec that leaves at 20:30.  With 
Wifi, even.  It's a reasonable choice, and about $100 less than a one way 
car rental.  The Quebec bus station is adjacent to the train station and a 
quick taxi to hotels.
R's,
John
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