Pros
Great starting salary for a job fresh out of undergrad. Except for vacation time the benefits are quite good. Beautiful campus with great food that is also quite cheap. Nice signing bonus. As a developer there's a chance you could have a private office starting out.
Cons
Very limited vacation time. Lengthy training period. To have any hope of raises/advancement you have to work very long hours. Most of the work will be with very obscure and or obsolete technologies(Visual Basic 6 and MUMPS). A very lucky few will get to work with more modern things like C#, iOS, or Android, but everyone needs to work with MUMPS. Epic likes to present itself to its employees as a very open company, but many processes are so opaque(especially advancement) that they breed paranoia. Very high turnover rate. Software developers probably have the lowest turnover, but don't be surprised if many the people you start with are gone after a year.