They will promise you the moon to come on board, but the opportunities for training and advancement dry up quickly if you are an employee on the floor - no matter your experience or qualifications.
Management is a bit messy. Production supervisors are often apathetic and have to be the conduit from a management team that doesn't really understand that their production targets can't be met without proper staffing, equipment, or enough raw goods. They try to fill positions, but are afraid to cut loose workers that can't do the job properly or even focus on food safety. Kind of sad, really.
Best part of the job is the people on the floor as they work hard and are generally welcoming and fun. Worst part is the realization that you mean little to management and that you're just a cog in a wheel. You could show up every day and be a superstar, but it won't really get you anywhere.
Good for a short-term gig or if you want something relatively low stress, but don't expect to advance.
Great people on the floor, lots of hours if you want them
No real chance to advance, bad blood between managment and union members