Pros
It's an easygoing place to work and a great place to park yourself if you have a PhD in environmental economics. The workplace is pleasant enough and the location is very attractive near Dupont and Logan Circles. People tend to keep relaxed work hours and many of the folks are genuinely pleasant.
Cons
The management of the place has been schizophrenic. Complete overhauling and restructuring of the program structure twice in the span of two years -- without ever admitting it made huge mistakes in the redesigns -- and completely turning over the leadership and core staffing in Communications and Development, all while fundraising continues to suffer. Unsurprisingly morale is poor. The organization has no sense of its core mission: is it a DC think tank? an environmental economics department outside of a university? a wonky brainiac best friend to corporations that purport to care about the environment? perhaps a bit of all of the above? The management and senior leadership is secretive, opaque, and generates no trust and maintains no faith from the researchers and staff. There is no avenue for advancement for most personnel without a PhD in economics, and there is an unabashed First Class Citizen/Second Class Citizen division. A brand-new, baby Ph.D. will walk into the organization with more salary and prestige than a highly qualified masters-trained professional with decades of experience in the sector. To some extent that is like many think tanks -- there is the "think" and there is the "tank" -- but RFF skews more toward that dichotomy than most.