Vantaggi
I absolutely love the laboratory I am in, and find the overall research community within the health system quite wonderful to work with. There is an astounding amount of genuine collaboration and shared interests - and often so many talks and opportunities to meet with other people that it can be hard to get actual work done!
Svantaggi
Your experience may vary wildly depending on which group you end up with, so careful attention must be paid with who you interview with. Also, particularly within the psychiatry department (the area I am most acquainted with), HR is an absolute nightmare. They never have the forms needed, I know of several people who did not get a paycheck on time (and had to re-fill paperwork for direct deposit 3-4x, etc).