Pros
Mercy is a decent place to work with a progressive medical director and excellent protocols. Co-workers are typically excellent as well. Decent equipment for a private service for the most part, although if you work in an area without a tax subsidy you can expect to use worn-out monitors without automatic B/P, etc. Best EMS service in South/Central Missouri, you won't find better unless looking in St. Louis area.
Cons
Ideas to improve procedures and care are not well received from field staff by the operations supervisors/field supervisors/regional managers, although the medical director is open to improvements. Redundant and obsolete double or triple documentation is required if working in the rural departments. Until you learn to navigate the bureaucracy you can forget having a positive effect on the service as a whole.