It is hit or miss
It is hit or miss, but a classical suburban public transports.
You think that it is like the STM's every 10 min. or so? No, with STL buses, like the line 42, prepare to wait for every 30 minutes of interval! Some "underused" bus lines are even longer, every hour.
Regarding bus drivers, some of them drive really badly, like not doing their stops completely and harsh turns on intersections, particularly going towards Montreal island (like line 52)

