Pros
The people are the best. Skilled, hard working, friendly. The books. Its wonderful getting to be around the books. The union will do everything in there power to have your back.
Cons
Management is disconnected with actual operations and the managers that do care or advocated for their teams get punished or forced out. HR actively watches and jumps on any and all opportunities to add notes in your files about misconduct of any variety, so if the opportunity arises they can discipline you enough times to fire you eventually. They have a bad habit of firing people or disciplining people for small infractions. Anyone who has been there the longest can now tell you of the fallen coworker who were driven out to make way for new part time employees. Cameras watch your every move.