Pros
Decent pay for what it is, Tuition reimbursement, Blue collar relatable coworkers, Fairly laxed for what it is as long as you show up e.g. People smelling like weed, and drinks from the night before (Or the day of) wasn't uncommon. Just about everyone has headphones in, etc... Part time supervisors were mostly cool in my experience as a Loader, even if they tended to be young and inexperienced (Full disclosure I'm younger myself so it was probably a case of being relatable). You won't need a gym membership as long as you work here.
Cons
The Union is worthless, don't expect anything to go in your favor. The work conditions are super sketchy (Gloves are a must and I'd recommend a back brace and knee pads). I can't' count the number of times hazardous material spilled in a truck and they still had me in there unloading breathing in god knows what. Mostly people are "cliqued up" like it's High School. Favoritism is EVERYWHERE (Whites looking out for Whites, Blacks looking out for Blacks, Latinos looking out for Latinos, etc...). Fulltime supervisors in my experience were mostly not good people. Frequently not given breaks or had breaks cut short by supervisors which is ILLEGAL. Supervisors will be constantly pressuring you to leave early (It's incumbent on you to push back or file a grievance if you have too because if you're a part-timer in the union you're guaranteed 3 1/2 hours. Even if they send you some home early you're still guaranteed that 3 1/2 hours).