Pros
The Gallup name is synonymous with polling and survey research. The Gallup brand is unbeatable in that sense. Gallup allows you to set your own schedule and you have some freedom in choosing what projects you work on. The people who work there are generally pleasant and nice.
Cons
The Gallup name is synonymous with polling and survey research. Since the company is trying to re-brand itself as an elite management consulting firm having such strong brand awareness is a big problem. Potential customers are often shocked to learn Gallup is a 'consulting' firm. In truth, the actual consulting work is limited, most engagements are Gallup's proprietary survey research products. Given all this there is something of an identity crisis and lack of strategic direction at the firm. I would hesitate to recommend anyone accept a job there until those problems are worked out. Management is poor to non-existent. Gallup is an every-man-for-himself environment in the worst possible way. The firm doesn't do a good job of supporting its employees professionally. No smart-phones, no professional memberships, very limited outside training. Good luck even getting a copy of a book about some cutting edge management techniques. Projects are not sold very effectively. My billing rate at me new firm is 3x what is was at Gallup for the same work. For my projects alone the firm was leaving lots of money on the table. The pay is low and benefits are very poor. The hours requirement is high at 2300 minimum per year. The vacation policy is very strict and generally inflexible. Vacation does not increase with tenure. No federal holidays are given, you need to use your own vacation time if you want Christmas or Thanksgiving off. It can be very hard to increase your pay. The old bonus system encouraged people to take on more work and paid them for it. Now, raises are hard to come by and promotions are difficult to get.