Pros
Epic is a great launching board into Healthcare IT. No matter what your experience level is out of college, you can get a high-caliber salaried job in the field as long as you're smart. You'll make tons of money really fast, eat like a king, and travel to interesting places. You're allowed to work fairly independently and handle things the way you see fit. If you think the customer should implement a workaround, you can go ahead and say it, and your word will be the word of the company. If you think a piece of code should be fixed, you can assign it to yourself and draft a design. You'll have an extraordinary amount of power and responsibility for a recent graduate. Some days, you'll look back at the impact of a fix or change you performed and it will blow your mind.
Cons
Your job experience is a complete shuffle. Rather than being on client projects with a start and finish, you will be assigned several customer organizations to support, and they'll be yours for the entire duration of your career with Epic (with a few exceptions). If one of them is awful to you, you're probably stuck. There's no career advancement. There are new programs being created constantly to mask this, different ways of becoming "gurus," "experts," "masterminds," etc. but none of these are actually promotions. A TS can get a slightly better job title by becoming a Coordinator or a Team Lead, but they'll still be stuck doing the same kind of work plus extra. You'll keep getting asked to do more and more, but you won't be rewarded for working harder. There's a lot of denial like this that goes on. HR will tell you that the turnover rate isn't bad (look around you). R&D leads will tell you that the technology isn't outdated (just look at it). Trust your eyes- Epic isn't planning on keeping or growing you. If you take this gig, you probably won't be at it more than a couple years, and the noncompete will keep you out of work unless you've kept your other skills sharp.