Pros
Express Scripts offers a strong level of stability. Because it is PBM, the health insurance benefits are inexpensive and provide a lot of coverage. With several locations throughout the US and Canada, if you are looking to relocate, that is always an option and HR is very helpful with that. There are also many opportunities for advancement or to move laterally to another department.
Cons
You don't get a lot of holidays off, and PTO can be pretty difficult to come by. Also, they are very particular about metrics and do not seem concerned with work-life balance. They say they are, but really are not. Also, this company made billions and stands to earn more if the Medco merger is successful, but employees will not receive a bonus and I'm sure any pay increases will be minimal.