Pros
Great executive leadership team with a year-in, year-out consistent message around vision, mission, culture, and goals. Great health benefits, and for those based in the St. Louis area, even more with onsite health clinics, "WWT Day" at Busch stadium for a Cardinals game, onsite massages, tread-desks, and excellent facilities. The company has grown at incredible pace since I came on 7 years ago, opportunities to advance/change roles abound. It's a fun place to work hard and play hard.
Cons
As is typical of any fast-growing org, we've had some relatively minor pains associated with the growth. These kind of things are normally resolved quickly, as we all have a responsibility to hold each other accountable.