Cargair is as good as any other school out there. If I had one complaint, it would be the age of their fleet. They run "experienced" airplanes. Both Aztecs they use for their Multi / IFR training are good airplane, they just don't have the latest toys in them.
I too would go to the Mascouche base. Same distance and driving time from tdowntown Montreal, but minimumtaxi time to get airborn.
D