Pros
High autonomy; Merit-based compensation and incentives; Huge impact / meaningful work; Early growth opportunities; Very competitive compensation (given the cost of living in Madison especially); Madison itself (top 3 places to live in US); Working with smart people; New challenges every week.
Cons
If you work at Epic, you will likely work hard... but I honestly feel like you "reap what you sow. ". Remember that saying "Yes, if..." or "No" is OK if your workload is already very high - Epic hires a lot of bright, motivated individuals who have the tendency to take on more than they can handle and feel like they can't offload some of their work after the fact. If you can manage your workload and put in the extra effort when necessary, you'll do great.