Pros
Extremely high quality people at all levels, not only with respect to subject matter expertise and professional recognition, but also in terms of personality, respect for junior staff, and collegial atmosphere. The organization is very serious about developing the next generation of natsec talent. Many opportunities for independent publishing, also authoring/co-authoring publications with senior fellows (not anonymously or in acknowledgments section as is the practice in virtually all other DC think tanks). Access to luminaries in the natsec field. Great opportunities for building network. Lots of professional development opportunities and social events.
Cons
There are no real cons I can think of, especially comparing this organization to the work culture of many other think tanks in DC.