Given the current state of the economy and the company there aren't many. I will say if you are lucky enough not to be in manufacturing they are pretty flexible with getting a time off here and there to take care of personal matters.
Desventajas
The downside of working for Quebecor is the fact that the presses just don't stop. The work is is consistent and boring because it is. The work is so overwhelming at times that you easily become scared to take time off for fear of falling behind. The company is currently in bankruptcy and supplies are hard to come buy to the point that some employees buy their own supplies to get the work done. Equipment is old and ratty, and software is outdated. Maybe once we emerge from backruptcy we will invest in infrastructure.