I work in one of the Ball manufacturing plants.

Pros: Good pay, clean work environment, 401k, company stock purchase option, quarterly bonuses, yearly raises. Most co-workers are cooperative.
If you have the good fortune to land on the right crew, supervisors are fair and personable.

Cons: No work life balance due to work schedule (12 hour shifts, 4 on/4 off, rotating shifts every 4 months).
Poor medical benefits. Doctors are reluctant to take new patients with Ball insurance due to poor reimbursement. High deductibles and part of premium is the employee's responsibility.
Factories are not climate controlled and can be extremely hot in the summer months.
Some co-workers lazy or unqualified (see nepotism/favoritism below).
Promotions/hirings are based on nepotism and favoritism.
Some supervisors aren't the easiest to work with/for.

Bottom line: It's factory work. Ball is better than most, but not the best place to work.