Pros
There are amazing, talented people at Gallup (although just as many have left). You'll be introduced to concepts that make an amazing workplace (you just won't find them practiced at Gallup).
Cons
As many of the earlier posts indicate, Gallup has undergone a massive organizational change. While the change as an idea might be positive, the execution of this change has ruined the morale, the culture, and the reputation of the company. The earlier posts recap this in great detail and with high accuracy. The bottom line is that employees who naturally worked long hours (over 2300), felt motivated to exceed expectations, and who gave EVERYTHING to the organization were disrespected and reminded that even the most perfect company is still a business. It's not about the reduced pay or pay caps, it's about senior leaders bragging about the financial success the company is now enjoying (um, it's likely due to the surplus in payroll you have). It's not about the true lack of transparency; it's about the fact that we pretend to be transparent. It's not about some turnover following the change; it's about treating those once valued employees as crap and replacing them with 21 year olds. It's not about all of the new policies and rules; it's about asking for your employees input on what changes make the most sense for those most affected. It is saddening to read these posts because so many people were emotionally impacted by the change. Before, I didn't need a website because I'd actively tell my friends, family, and random (qualified) strangers that they should be so lucky as to work for Gallup. Now, I visit a website to warn people against it.