Pros
FanDuel is a great place to work, with a CEO genuinely committed to creating a company he would want to work for. They put a big emphasis on hiring the right people for the job, so the people you work with are generally excellent. They provide perks around the office, from table tennis, food, soft drinks and beer, to gourmet coffee. There is little emphasis on employee conformity, and lots of emphasis on personal satisfaction and high quality software.
Cons
Fast company growth has resulted at times in scrambled attempts to control the different projects that are underway. There's technical debt from the company's early days, but with an ongoing project to resolve this. Employee morale has sometimes been low because of recent acquisitions and legal issues, but again the company is trying hard to fix this.