Pros
Solid, efficient company, ok compensation, chance for advancement if you can put up with the hard work and huge amount of hours required to get any recognition. Promotions are hard to come by but they do try to promote based on performance, so hard work does pay off. Since the focus is on performance, there is less bias (in my opinion) against gender, race or other common areas of work bias.
Cons
very demanding, lots of hours, not tolerant of mistakes. union employees are given better treatment than non-union. The Teamsters fight (and win) to keep employees jobs that deserve to get fired; ie, thieves, assaults, drugs, poor attendance, poor performance, poor attitudes. Management employees lose their jobs for poor results and when they try to address the problem employees they dont get backed.