Pros
Excellent work environment. Some of the best coworkers I could imagine having. Lot's of freedom to find the projects you are most interested in and to learn new things. Competitive salary. Average vacation policy (2-3 weeks paid depending on tenure) but 4 week paid sabbatical (salary, airfare, lodging) every 5 years. Amazing on-site lunch at subsidized prices. Fun campus.
Cons
Not many, especially nothing unique to a company of Epic's size that is growing so quickly. Policies and procedures change, but many times for the better not just for worse. There's always A LOT of work to be done, so if you don't set a good work-life balance and stick to it, it's easy to burn out or have your life become all about your work. However, if you decide what's right for you up front and stick to it, there's a lot of room to thrive and be happy in what you do. I will say that I'm in Technical Services, and it's much easier to do this in my role than in others like Project Management and Software Development.