Pros
Good pay, excellent benefits (although you'll be hard pressed to fit in all of the time off you're entitled to). Beautiful campus to work on, no cubicles, and great food available in the campus cafeteria/food courts. Probably the best thing I can say is that Epic will give you a shot at a great career, no matter what your background. They take smart, talented people and give them a chance to succeed, even if your education and work experience don't make you an "ideal" candidate.
Cons
Part of what makes Epic great is also a big part of what's wrong with the company. As I said before, they take talented people from all sorts of backgrounds and give them a shot. In other words, they throw a lot of smart, talented people at the wall to see what sticks. While I think this could be an excellent career for the right type of person, the workload, long hours, constant travel, and high levels of stress and responsibility tends to cause a lot of people to burn out quickly. They give you a lot of training, but if you've never had anything to do with Project Management, prepare for trial by fire. I'd never so much as seen a project plan when I was hired, but was still expected to excel immediately and handle a significant portion of a couple of multi-million dollar installs with a great deal of autonomy. If I'd had experience, or been someone with an aggressive, type-A personality, I might have stayed longer. It's a great place to work if you really love the job, but if you think the work itself is "just OK," you'll soon find yourself overwhelmed and bored at the same time.