Pros
The company is very strong and there is definite stability. Since there are many facets to UPS, pofessional gowth is a positive as well. UPS is an ideal company to start a career with, not necessarily so for one in their mid career depending on the position. Strong brand recognition and gaining solid experience will be a plus for any resume. UPS wants to retain and promote from within so have expectations to be there for the long haul if you truly want to make a go of it. The company is relatively flat, there are many supervisors and managers, but at the same time there is plenty of promotion opportunity.
Cons
Work/Life Balance is nonexistent. According to UPS, there is no deadline that can go unmet, no matter how insignificant. Also pay is not in line with performance. You wil often find that salary for positions is at or below average for a given role or industry. Very conservative policies. Expect to be stretched thin and not necessarily rewarded as you feel that you should. In many cases, it may be difficult to advance your career, depending on the group that you work in. There is a tendancy for certain managers to "tap your brakes" since there is an approval process to be considered for supervisory roles.