Pros
Pay isn't as bad as people say it is here -- it's just not BCG/Bain/McK level. Most work is relatively interesting. Having worked in both enterprise (private sector) and government (public sector) consulting, the enterprise work is far more interesting. If you are a super bubbly energetic person, the atmosphere is great. Brand is good (helped me leverage my career)
Cons
Ok. I get that there's a lot of work put into creating company culture, but gimmicky doesn't start to explain the absolute cheesiness of the company's culture. People put terrible compliments on little stickers and put them on your desk. You are indoctrinated with 10 books on "behavioral science" and each form of "camaraderie" is forced and painful. They put you through insane interviews to make sure you're the most type A person ever (seemingly authoritarian) and like other reviews have said, they will exterminate you. Ultimately, Gallup people are not smart. They're hardworking, they're good people, and they're all about drinking the kool-aid. Individualism is not tolerated here.