Pros
None. Theoretically, you trade pay for job security, but that's not the case, because management has no loyalty towards employees.
Cons
Pay is way below market. Constant meaningless meetings that don't amount to anything except a waste of everyone's time. Management afraid of making decisions and needs the whole team to sign off 500 times before they do anything. You don't even have job security in the end. Zero loyalty to long-time employees. For example, Vectren's employees that were laid off after the acquisition all received 2-year severance packages regardless of seniority. CNP's employees didn't even get a quarter of the value Vectren's employees got. Management fired their own employees, many of whom have been there for a long time, and didn't even deign to take care of them -- because, of course, profits are more important. They sure didn't forget to take care of their own executive bonuses though!