Pros
Great salary and benefits, although there is an on-going process to reduce both and a growing expectations to work longer hours. That being said, if you're working on one of the many great programs AARP has to offer, it can be a wonderful challenge and great career building tool. If you are offered a job (know that HR is rather incompetent, so patience is a virtue), take it with the expectation that you may only be there a few years, but it will look great on your resume. If you are one of the "chosen" and protected by upper management, you will excel and do well, until your protectors are replaced.
Cons
As making money and being "more corporate" takes precedence, the losers are the mission and members. Any long term employee will tell you, it's not what it used to be when it comes to placing members first. Contrary to appearances, there is growing racial tension within the organization and ironically issues of ageism.