Pros
Good for people who are ambitious, self motivated and know where they would like to go. They usually promote within if you express and are proactive about showing you can go beyond your duties and offer to do more for them. They are also supportive about continued education. It is helpful if you make connections with fellow employees outside of your area.
Cons
Company will not usually not make an active effort to develop you (outside of what is required such as new software training or initiatives that they are implementing). There is a general turn around of employees from admins to nurses and physicians. While the facilities are usually nice, some areas need updates and the hospitals are losing market shares to John Hopkins and Inova. I would recommend this company as a stepping stone as you will learn that you can get stuck where you are easily.